From 25a2104fa766c3a462694fd1bb296252358c4388 Mon Sep 17 00:00:00 2001
From: Vinay Keshava <vinaykeshava@disroot.org>
Date: Mon, 3 Apr 2023 14:13:38 +0530
Subject: [PATCH] New upstream version 15.8.5+ds1

---
 .gitlab-ci.yml                                |  10 +-
 CHANGELOG.md                                  |  21 +
 GITALY_SERVER_VERSION                         |   2 +-
 GITLAB_PAGES_VERSION                          |   2 +-
 VERSION                                       |   2 +-
 .../markdown/render_observability.js          |  45 +-
 .../javascripts/pages/projects/project.js     |   3 +-
 app/assets/javascripts/repository/index.js    |   9 +-
 .../repository/utils/ref_switcher_utils.js    |  30 +-
 .../concerns/confirm_email_warning.rb         |  14 +-
 app/controllers/projects/blob_controller.rb   |  10 +
 app/controllers/projects/refs_controller.rb   |   2 +-
 app/controllers/projects/tree_controller.rb   |   9 +
 app/controllers/projects_controller.rb        |  10 +-
 .../environments/environment_names_finder.rb  |  11 +-
 app/finders/notes_finder.rb                   |   8 +
 app/models/hooks/web_hook.rb                  |  18 +-
 app/models/project_feature.rb                 |   3 +-
 app/policies/project_policy.rb                |   1 -
 .../push_options_handler_service.rb           |  10 +-
 .../projects/page_out_of_bounds.html.haml     |   2 +-
 .../projects/tree/_tree_header.html.haml      |   2 +-
 ...ify_last_error_from_project_mirror_data.rb |  26 +
 db/schema_migrations/20230208131808           |   1 +
 .../snapshot_spec.html                        |  16 +-
 lib/api/repositories.rb                       |   4 +
 .../filter/inline_observability_filter.rb     |  13 +-
 lib/extracts_ref.rb                           |  14 +-
 ...ify_last_error_from_project_mirror_data.rb |  17 +
 lib/gitlab/unicode.rb                         |   6 +
 lib/gitlab/url_sanitizer.rb                   |  94 ++-
 lib/rouge/formatters/html_gitlab.rb           |   9 +-
 locale/gitlab.pot                             |   3 +
 .../admin/hooks_controller_spec.rb            |   3 +-
 .../concerns/confirm_email_warning_spec.rb    |  34 +-
 .../projects/blob_controller_spec.rb          |  33 +-
 .../projects/clusters_controller_spec.rb      |  23 +-
 .../prometheus_api_controller_spec.rb         |  23 +-
 .../projects/refs_controller_spec.rb          |   4 +-
 .../projects/tree_controller_spec.rb          |  37 +-
 spec/controllers/projects_controller_spec.rb  |  63 ++
 spec/factories/project_hooks.rb               |   2 +-
 spec/features/admin/users/user_spec.rb        |  30 +
 .../environment_names_finder_spec.rb          |  26 +-
 spec/finders/notes_finder_spec.rb             |  20 +
 .../emails/valid_reply_signed_smime.eml       | 588 +++++++++---------
 .../markdown/render_observability_spec.js     |  12 +-
 .../utils/ref_switcher_utils_spec.js          |  31 +-
 spec/helpers/hooks_helper_spec.rb             |   2 +-
 .../inline_observability_filter_spec.rb       |  52 ++
 ...ast_error_from_project_mirror_data_spec.rb |  84 +++
 spec/lib/gitlab/url_sanitizer_spec.rb         |  31 +-
 spec/lib/rouge/formatters/html_gitlab_spec.rb |  21 +-
 ...ast_error_from_project_mirror_data_spec.rb |  37 ++
 .../project_error_tracking_setting_spec.rb    |   2 +-
 spec/models/hooks/web_hook_spec.rb            |  28 +
 spec/policies/project_policy_spec.rb          |  50 +-
 spec/requests/api/repositories_spec.rb        |  16 +
 .../push_options_handler_service_spec.rb      |  15 +
 spec/services/web_hook_service_spec.rb        |   4 +-
 .../page_out_of_bounds.html.haml_spec.rb      |  26 +
 61 files changed, 1271 insertions(+), 453 deletions(-)
 create mode 100644 db/post_migrate/20230208131808_nullify_last_error_from_project_mirror_data.rb
 create mode 100644 db/schema_migrations/20230208131808
 create mode 100644 lib/gitlab/background_migration/nullify_last_error_from_project_mirror_data.rb
 create mode 100644 spec/lib/gitlab/background_migration/nullify_last_error_from_project_mirror_data_spec.rb
 create mode 100644 spec/migrations/nullify_last_error_from_project_mirror_data_spec.rb
 create mode 100644 spec/views/explore/projects/page_out_of_bounds.html.haml_spec.rb

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5bb29a7aa3..28ac2532f1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -30,7 +30,7 @@ workflow:
     # If `$FORCE_GITLAB_CI` is set, create a pipeline.
     - if: '$FORCE_GITLAB_CI'
       variables:
-        RUBY_VERSION: "3.0"
+        RUBY_VERSION: "2.7"
     # As part of the process of creating RCs automatically, we update stable
     # branches with the changes of the most recent production deployment. The
     # merge requests used for this merge a branch release-tools/X into a stable
@@ -46,10 +46,10 @@ workflow:
     # For (detached) merge request pipelines.
     - if: '$CI_MERGE_REQUEST_IID'
       variables:
-        RUBY_VERSION: "3.0"
-        OMNIBUS_GITLAB_RUBY3_BUILD: "true"
-        OMNIBUS_GITLAB_CACHE_EDITION: "GITLAB_RUBY3"
-        PIPELINE_NAME: 'Ruby 3 $CI_MERGE_REQUEST_EVENT_TYPE MR pipeline'
+        RUBY_VERSION: "2.7"
+        OMNIBUS_GITLAB_RUBY2_BUILD: "true"
+        OMNIBUS_GITLAB_CACHE_EDITION: "GITLAB_RUBY2"
+        PIPELINE_NAME: 'Ruby 2 $CI_MERGE_REQUEST_EVENT_TYPE MR pipeline'
     # For the scheduled pipelines, we set specific variables.
     - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH && $CI_PIPELINE_SOURCE == "schedule"'
       variables:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6071648bf6..bf4ae0fdef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,27 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 15.8.5 (2023-03-30)
+
+### Security (16 changes)
+
+- [Fix rubocop offenses in lib/gitlab/url_sanitizer.rb](gitlab-org/security/gitlab@ddc04cf7059e411e20033b95e1297381d64d4b22) ([merge request](gitlab-org/security/gitlab!3175))
+- [Add checks to remove open redirects from Observability URL](gitlab-org/security/gitlab@a22ce3851128eb900dbabe9e38c07889967a2915) ([merge request](gitlab-org/security/gitlab!3032))
+- [Redirect to tree from project root on ref collision](gitlab-org/security/gitlab@fad24ae9d8fa0e7bd9eff0c9e6914c8267451b4d) ([merge request](gitlab-org/security/gitlab!3134))
+- [Fixes soft email confirmation alert vulnerability](gitlab-org/security/gitlab@85be0fbfc98cdb774d68070479e35be22f6ba40a) ([merge request](gitlab-org/security/gitlab!3125))
+- [Restrict Prometheus API access on public projects](gitlab-org/security/gitlab@2df2fa2dc4b9015d044d0ddc5d26e17e9e5f85c0) ([merge request](gitlab-org/security/gitlab!3164))
+- [Verify that users have access to the parent of the fork](gitlab-org/security/gitlab@53f7f06843eea4d666d361f5a1d349bd1e3f4312) ([merge request](gitlab-org/security/gitlab!3085))
+- [Protect webhook secrets by resetting url_variables](gitlab-org/security/gitlab@9fa9dbff463f6015ffaf8d082db3d41ae623763e) ([merge request](gitlab-org/security/gitlab!3141))
+- [Replace Unicode space chars with spaces](gitlab-org/security/gitlab@20d77d4d680d13f916fb69de0d79802753421c8f) ([merge request](gitlab-org/security/gitlab!3137))
+- [Check access to parent when creating and updating epics](gitlab-org/security/gitlab@0fed113756b27a3a078f87f29711b225e1ed4cce) ([merge request](gitlab-org/security/gitlab!3150))
+- [Improve Gitlab::UrlSanitizer regex to match more URIs](gitlab-org/security/gitlab@2285088f37aca877b1dcd59c728cdf33171b30cb) ([merge request](gitlab-org/security/gitlab!3109))
+- [Check access to target project before looking for branch](gitlab-org/security/gitlab@37b8d855d87c88170322e6a6d4c285fee6c6cb64) ([merge request](gitlab-org/security/gitlab!3038))
+- [Fix the potential leak of internal notes](gitlab-org/security/gitlab@66f8cc2eb13509397b980d53a4b67ca03d8903f7) ([merge request](gitlab-org/security/gitlab!3121))
+- [Filter namespace environments by feature visibility](gitlab-org/security/gitlab@e1859de393b4794e1356d6318e56ede4b557c059) ([merge request](gitlab-org/security/gitlab!3112))
+- [Check access to reorder issues in epic tree](gitlab-org/security/gitlab@13f9c6231cea956f73355c5b5b820163f523e7d8) ([merge request](gitlab-org/security/gitlab!3100))
+- [Fix security report authorization](gitlab-org/security/gitlab@19baab85c7a5a64a09e3e4808e8550fc72e18323) ([merge request](gitlab-org/security/gitlab!3105))
+- [Prevent XSS attack in "Maximum page reached" page](gitlab-org/security/gitlab@be5491c5db05161e4b14d53900dd19b66848de48) ([merge request](gitlab-org/security/gitlab!3131))
+
 ## 15.8.4 (2023-03-02)
 
 ### Security (12 changes)
diff --git a/GITALY_SERVER_VERSION b/GITALY_SERVER_VERSION
index da467831eb..317374c81d 100644
--- a/GITALY_SERVER_VERSION
+++ b/GITALY_SERVER_VERSION
@@ -1 +1 @@
-15.8.4
\ No newline at end of file
+15.8.5
\ No newline at end of file
diff --git a/GITLAB_PAGES_VERSION b/GITLAB_PAGES_VERSION
index da467831eb..317374c81d 100644
--- a/GITLAB_PAGES_VERSION
+++ b/GITLAB_PAGES_VERSION
@@ -1 +1 @@
-15.8.4
\ No newline at end of file
+15.8.5
\ No newline at end of file
diff --git a/VERSION b/VERSION
index da467831eb..317374c81d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-15.8.4
\ No newline at end of file
+15.8.5
\ No newline at end of file
diff --git a/app/assets/javascripts/behaviors/markdown/render_observability.js b/app/assets/javascripts/behaviors/markdown/render_observability.js
index 704d85cf22..d5d46c10ef 100644
--- a/app/assets/javascripts/behaviors/markdown/render_observability.js
+++ b/app/assets/javascripts/behaviors/markdown/render_observability.js
@@ -7,23 +7,36 @@ export function getFrameSrc(url) {
 }
 
 const mountVueComponent = (element) => {
-  const url = [element.dataset.frameUrl];
+  const { frameUrl, observabilityUrl } = element.dataset;
 
-  return new Vue({
-    el: element,
-    render(h) {
-      return h('iframe', {
-        style: {
-          height: '366px',
-          width: '768px',
-        },
-        attrs: {
-          src: getFrameSrc(url),
-          frameBorder: '0',
-        },
-      });
-    },
-  });
+  try {
+    if (
+      !observabilityUrl ||
+      !frameUrl ||
+      new URL(frameUrl)?.host !== new URL(observabilityUrl).host
+    )
+      return;
+
+    // eslint-disable-next-line no-new
+    new Vue({
+      el: element,
+      render(h) {
+        return h('iframe', {
+          style: {
+            height: '366px',
+            width: '768px',
+          },
+          attrs: {
+            src: getFrameSrc(frameUrl),
+            frameBorder: '0',
+          },
+        });
+      },
+    });
+  } catch (e) {
+    // eslint-disable-next-line no-console
+    console.error(e);
+  }
 };
 
 export default function renderObservability(elements) {
diff --git a/app/assets/javascripts/pages/projects/project.js b/app/assets/javascripts/pages/projects/project.js
index 4c9eb830ff..27659348dc 100644
--- a/app/assets/javascripts/pages/projects/project.js
+++ b/app/assets/javascripts/pages/projects/project.js
@@ -118,9 +118,10 @@ export default class Project {
             const urlParams = { [fieldName]: ref };
             if (params.group === BRANCH_GROUP_NAME) {
               urlParams.ref_type = BRANCH_REF_TYPE;
-            } else {
+            } else if (params.group === TAG_GROUP_NAME) {
               urlParams.ref_type = TAG_REF_TYPE;
             }
+
             link.href = mergeUrlParams(urlParams, linkTarget);
           }
 
diff --git a/app/assets/javascripts/repository/index.js b/app/assets/javascripts/repository/index.js
index e5d22f50d7..0f6b159ffc 100644
--- a/app/assets/javascripts/repository/index.js
+++ b/app/assets/javascripts/repository/index.js
@@ -2,7 +2,7 @@ import { GlButton } from '@gitlab/ui';
 import Vue from 'vue';
 import Vuex from 'vuex';
 import { parseBoolean } from '~/lib/utils/common_utils';
-import { escapeFileUrl, visitUrl } from '~/lib/utils/url_utility';
+import { joinPaths, escapeFileUrl, visitUrl } from '~/lib/utils/url_utility';
 import { __ } from '~/locale';
 import initWebIdeLink from '~/pages/projects/shared/web_ide_link';
 import PerformancePlugin from '~/performance/vue_performance_plugin';
@@ -119,7 +119,7 @@ export default function setupVueRepositoryList() {
 
     if (!refSwitcherEl) return false;
 
-    const { projectId, projectRootPath } = refSwitcherEl.dataset;
+    const { projectId, projectRootPath, refType } = refSwitcherEl.dataset;
 
     return new Vue({
       el: refSwitcherEl,
@@ -127,11 +127,12 @@ export default function setupVueRepositoryList() {
         return createElement(RefSelector, {
           props: {
             projectId,
-            value: ref,
+            value: refType ? joinPaths('refs', refType, ref) : ref,
+            useSymbolicRefNames: true,
           },
           on: {
             input(selectedRef) {
-              visitUrl(generateRefDestinationPath(projectRootPath, selectedRef));
+              visitUrl(generateRefDestinationPath(projectRootPath, ref, selectedRef));
             },
           },
         });
diff --git a/app/assets/javascripts/repository/utils/ref_switcher_utils.js b/app/assets/javascripts/repository/utils/ref_switcher_utils.js
index f296b5e9b4..fc0d521ad5 100644
--- a/app/assets/javascripts/repository/utils/ref_switcher_utils.js
+++ b/app/assets/javascripts/repository/utils/ref_switcher_utils.js
@@ -15,22 +15,30 @@ const NAMESPACE_TARGET_REGEX = /(\/-\/(blob|tree))\/.*?\/(.*)/;
  * @param {string} projectRootPath - The root path for a project.
  * @param {string} selectedRef - The selected ref from the ref dropdown.
  */
-export function generateRefDestinationPath(projectRootPath, selectedRef) {
-  const currentPath = window.location.pathname;
-  const encodedHash = '%23';
+
+export function generateRefDestinationPath(projectRootPath, ref, selectedRef) {
+  const url = new URL(window.location.href);
+  const currentPath = url.pathname;
+  let refType = null;
   let namespace = '/-/tree';
   let target;
+  let actualRef = selectedRef;
+
+  const matches = selectedRef.match(/^refs\/(heads|tags)\/(.+)/);
+  if (matches) {
+    [, refType, actualRef] = matches;
+  }
+  if (refType) {
+    url.searchParams.set('ref_type', refType);
+  } else {
+    url.searchParams.delete('ref_type');
+  }
+
   const match = NAMESPACE_TARGET_REGEX.exec(currentPath);
   if (match) {
     [, namespace, , target] = match;
   }
+  url.pathname = joinPaths(projectRootPath, namespace, actualRef, target);
 
-  const destinationPath = joinPaths(
-    projectRootPath,
-    namespace,
-    encodeURI(selectedRef).replace(/#/g, encodedHash),
-    target,
-  );
-
-  return `${destinationPath}${window.location.hash}`;
+  return url.toString();
 }
diff --git a/app/controllers/concerns/confirm_email_warning.rb b/app/controllers/concerns/confirm_email_warning.rb
index ec5140bf22..2711c82327 100644
--- a/app/controllers/concerns/confirm_email_warning.rb
+++ b/app/controllers/concerns/confirm_email_warning.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 module ConfirmEmailWarning
+  include Gitlab::Utils::StrongMemoize
   extend ActiveSupport::Concern
 
   included do
@@ -17,11 +18,9 @@ module ConfirmEmailWarning
     return unless current_user
     return if current_user.confirmed?
 
-    email = current_user.unconfirmed_email || current_user.email
-
     flash.now[:warning] = format(
       confirm_warning_message,
-      email: email,
+      email: email_to_display,
       resend_link: view_context.link_to(_('Resend it'), user_confirmation_path(user: { email: email }), method: :post),
       update_link: view_context.link_to(_('Update it'), profile_path)
     ).html_safe
@@ -29,7 +28,16 @@ module ConfirmEmailWarning
 
   private
 
+  def email
+    current_user.unconfirmed_email || current_user.email
+  end
+  strong_memoize_attr :email
+
   def confirm_warning_message
     _("Please check your email (%{email}) to verify that you own this address and unlock the power of CI/CD. Didn't receive it? %{resend_link}. Wrong email address? %{update_link}.")
   end
+
+  def email_to_display
+    html_escape(email)
+  end
 end
diff --git a/app/controllers/projects/blob_controller.rb b/app/controllers/projects/blob_controller.rb
index 4eda76f4f2..dd2f980e88 100644
--- a/app/controllers/projects/blob_controller.rb
+++ b/app/controllers/projects/blob_controller.rb
@@ -31,6 +31,7 @@ class Projects::BlobController < Projects::ApplicationController
   before_action :authorize_edit_tree!, only: [:new, :create, :update, :destroy]
 
   before_action :commit, except: [:new, :create]
+  before_action :check_for_ambiguous_ref, only: [:show]
   before_action :blob, except: [:new, :create]
   before_action :require_branch_head, only: [:edit, :update]
   before_action :editor_variables, except: [:show, :preview, :diff]
@@ -145,6 +146,15 @@ class Projects::BlobController < Projects::ApplicationController
     end
   end
 
+  def check_for_ambiguous_ref
+    @ref_type = ref_type
+
+    if @ref_type == ExtractsRef::BRANCH_REF_TYPE && ambiguous_ref?(@project, @ref)
+      branch = @project.repository.find_branch(@ref)
+      redirect_to project_blob_path(@project, File.join(branch.target, @path))
+    end
+  end
+
   def commit
     @commit ||= @repository.commit(@ref)
 
diff --git a/app/controllers/projects/refs_controller.rb b/app/controllers/projects/refs_controller.rb
index 8ac6d872aa..0b52d03ab9 100644
--- a/app/controllers/projects/refs_controller.rb
+++ b/app/controllers/projects/refs_controller.rb
@@ -22,7 +22,7 @@ class Projects::RefsController < Projects::ApplicationController
           when "tree"
             project_tree_path(@project, @id)
           when "blob"
-            project_blob_path(@project, @id)
+            project_blob_path(@project, @id, ref_type: ref_type)
           when "graph"
             if Feature.enabled?(:use_ref_type_parameter, @project)
               project_network_path(@project, @id, ref_type: ref_type)
diff --git a/app/controllers/projects/tree_controller.rb b/app/controllers/projects/tree_controller.rb
index 737a629043..1f7912e15d 100644
--- a/app/controllers/projects/tree_controller.rb
+++ b/app/controllers/projects/tree_controller.rb
@@ -28,6 +28,15 @@ class Projects::TreeController < Projects::ApplicationController
   def show
     return render_404 unless @commit
 
+    @ref_type = ref_type
+    if @ref_type == BRANCH_REF_TYPE && ambiguous_ref?(@project, @ref)
+      branch = @project.repository.find_branch(@ref)
+      if branch
+        redirect_to project_tree_path(@project, branch.target)
+        return
+      end
+    end
+
     if tree.entries.empty?
       if @repository.blob_at(@commit.id, @path)
         redirect_to project_blob_path(@project, File.join(@ref, @path))
diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index ee2c268ff3..ed7c163c10 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -172,11 +172,19 @@ class ProjectsController < Projects::ApplicationController
       flash.now[:alert] = _("Project '%{project_name}' queued for deletion.") % { project_name: @project.name }
     end
 
+    if ambiguous_ref?(@project, @ref)
+      branch = @project.repository.find_branch(@ref)
+
+      # The files view would render a ref other than the default branch
+      # This redirect can be removed once the view is fixed
+      redirect_to(project_tree_path(@project, branch.target), alert: _("The default branch of this project clashes with another ref"))
+      return
+    end
+
     respond_to do |format|
       format.html do
         @notification_setting = current_user.notification_settings_for(@project) if current_user
         @project = @project.present(current_user: current_user)
-
         render_landing_page
       end
 
diff --git a/app/finders/environments/environment_names_finder.rb b/app/finders/environments/environment_names_finder.rb
index d4928f0fc8..ffb689f45e 100644
--- a/app/finders/environments/environment_names_finder.rb
+++ b/app/finders/environments/environment_names_finder.rb
@@ -32,18 +32,9 @@ module Environments
     end
 
     def namespace_environments
-      # We assume reporter access is needed for the :read_environment permission
-      # here. This expection is also present in
-      # IssuableFinder::Params#min_access_level, which is used for filtering out
-      # merge requests that don't have the right permissions.
-      #
-      # We use this approach so we don't need to load every project into memory
-      # just to verify if we can see their environments. Doing so would not be
-      # efficient, and possibly mess up pagination if certain projects are not
-      # meant to be visible.
       projects = project_or_group
         .all_projects
-        .public_or_visible_to_user(current_user, Gitlab::Access::REPORTER)
+        .filter_by_feature_visibility(:environments, current_user)
 
       Environment.for_project(projects)
     end
diff --git a/app/finders/notes_finder.rb b/app/finders/notes_finder.rb
index c542ffbce7..ea16bc0102 100644
--- a/app/finders/notes_finder.rb
+++ b/app/finders/notes_finder.rb
@@ -30,6 +30,7 @@ class NotesFinder
     notes = init_collection
     notes = since_fetch_at(notes)
     notes = notes.with_notes_filter(@params[:notes_filter]) if notes_filter?
+    notes = redact_internal(notes)
     sort(notes)
   end
 
@@ -181,6 +182,13 @@ class NotesFinder
 
     notes.order_by(sort)
   end
+
+  def redact_internal(notes)
+    subject = @project || target
+    return notes if Ability.allowed?(@current_user, :reporter_access, subject)
+
+    notes.not_internal
+  end
 end
 
 NotesFinder.prepend_mod_with('NotesFinder')
diff --git a/app/models/hooks/web_hook.rb b/app/models/hooks/web_hook.rb
index 49418cda3a..a787eb1d5f 100644
--- a/app/models/hooks/web_hook.rb
+++ b/app/models/hooks/web_hook.rb
@@ -41,7 +41,7 @@ class WebHook < ApplicationRecord
   after_initialize :initialize_url_variables
 
   before_validation :reset_token
-  before_validation :reset_url_variables, unless: ->(hook) { hook.is_a?(ServiceHook) }
+  before_validation :reset_url_variables, unless: ->(hook) { hook.is_a?(ServiceHook) }, on: :update
   before_validation :set_branch_filter_nil, if: :branch_filter_strategy_all_branches?
   validates :push_events_branch_filter, untrusted_regexp: true, if: :branch_filter_strategy_regex?
   validates :push_events_branch_filter, "web_hooks/wildcard_branch_filter": true, if: :branch_filter_strategy_wildcard?
@@ -189,7 +189,7 @@ class WebHook < ApplicationRecord
   # See app/validators/json_schemas/web_hooks_url_variables.json
   VARIABLE_REFERENCE_RE = /\{([A-Za-z]+[0-9]*(?:[._-][A-Za-z0-9]+)*)\}/.freeze
 
-  def interpolated_url
+  def interpolated_url(url = self.url, url_variables = self.url_variables)
     return url unless url.include?('{')
 
     vars = url_variables
@@ -215,7 +215,19 @@ class WebHook < ApplicationRecord
   end
 
   def reset_url_variables
-    self.url_variables = {} if url_changed? && !encrypted_url_variables_changed?
+    interpolated_url_was = interpolated_url(decrypt_url_was, url_variables_were)
+
+    return if url_variables_were.empty? || interpolated_url_was == interpolated_url
+
+    self.url_variables = {} if url_changed? && url_variables_were.to_a.intersection(url_variables.to_a).any?
+  end
+
+  def decrypt_url_was
+    self.class.decrypt_url(encrypted_url_was, iv: Base64.decode64(encrypted_url_iv_was))
+  end
+
+  def url_variables_were
+    self.class.decrypt_url_variables(encrypted_url_variables_was, iv: encrypted_url_variables_iv_was)
   end
 
   def next_failure_count
diff --git a/app/models/project_feature.rb b/app/models/project_feature.rb
index 11f4a3f3b6..d7bb9fa18a 100644
--- a/app/models/project_feature.rb
+++ b/app/models/project_feature.rb
@@ -36,7 +36,8 @@ class ProjectFeature < ApplicationRecord
     merge_requests: Gitlab::Access::REPORTER,
     metrics_dashboard: Gitlab::Access::REPORTER,
     container_registry: Gitlab::Access::REPORTER,
-    package_registry: Gitlab::Access::REPORTER
+    package_registry: Gitlab::Access::REPORTER,
+    environments: Gitlab::Access::REPORTER
   }.freeze
   PRIVATE_FEATURES_MIN_ACCESS_LEVEL_FOR_PRIVATE_PROJECT = { repository: Gitlab::Access::REPORTER }.freeze
 
diff --git a/app/policies/project_policy.rb b/app/policies/project_policy.rb
index b85a57f81c..cd05cc1763 100644
--- a/app/policies/project_policy.rb
+++ b/app/policies/project_policy.rb
@@ -404,7 +404,6 @@ class ProjectPolicy < BasePolicy
   end
 
   rule { can?(:metrics_dashboard) }.policy do
-    enable :read_prometheus
     enable :read_deployment
   end
 
diff --git a/app/services/merge_requests/push_options_handler_service.rb b/app/services/merge_requests/push_options_handler_service.rb
index 711978dc3f..66af1c087e 100644
--- a/app/services/merge_requests/push_options_handler_service.rb
+++ b/app/services/merge_requests/push_options_handler_service.rb
@@ -54,7 +54,15 @@ module MergeRequests
     end
 
     def validate_service
-      errors << 'User is required' if current_user.nil?
+      if current_user.nil?
+        errors << 'User is required'
+        return
+      end
+
+      unless current_user&.can?(:read_code, target_project)
+        errors << 'User access was denied'
+        return
+      end
 
       unless target_project.merge_requests_enabled?
         errors << "Merge requests are not enabled for project #{target_project.full_path}"
diff --git a/app/views/explore/projects/page_out_of_bounds.html.haml b/app/views/explore/projects/page_out_of_bounds.html.haml
index ef5ee2c679..e13768a3cc 100644
--- a/app/views/explore/projects/page_out_of_bounds.html.haml
+++ b/app/views/explore/projects/page_out_of_bounds.html.haml
@@ -18,5 +18,5 @@
       %h5= _("Maximum page reached")
       %p= _("Sorry, you have exceeded the maximum browsable page number. Please use the API to explore further.")
 
-      = render Pajamas::ButtonComponent.new(href: request.params.merge(page: @max_page_number)) do
+      = render Pajamas::ButtonComponent.new(href: safe_params.merge(page: @max_page_number)) do
         = _("Back to page %{number}") % { number: @max_page_number }
diff --git a/app/views/projects/tree/_tree_header.html.haml b/app/views/projects/tree/_tree_header.html.haml
index fd80735024..543cbc4e4e 100644
--- a/app/views/projects/tree/_tree_header.html.haml
+++ b/app/views/projects/tree/_tree_header.html.haml
@@ -2,7 +2,7 @@
 
 .tree-ref-container.gl-display-flex.mb-2.mb-md-0
   .tree-ref-holder
-    #js-tree-ref-switcher{ data: { project_id: @project.id, project_root_path: project_path(@project) } }
+    #js-tree-ref-switcher{ data: { project_id: @project.id, ref_type: @ref_type.to_s, project_root_path: project_path(@project) } }
 
   #js-repo-breadcrumb{ data: breadcrumb_data_attributes }
 
diff --git a/db/post_migrate/20230208131808_nullify_last_error_from_project_mirror_data.rb b/db/post_migrate/20230208131808_nullify_last_error_from_project_mirror_data.rb
new file mode 100644
index 0000000000..73e6f25749
--- /dev/null
+++ b/db/post_migrate/20230208131808_nullify_last_error_from_project_mirror_data.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class NullifyLastErrorFromProjectMirrorData < Gitlab::Database::Migration[2.1]
+  MIGRATION = 'NullifyLastErrorFromProjectMirrorData'
+  INTERVAL = 2.minutes
+  BATCH_SIZE = 10_000
+  SUB_BATCH_SIZE = 1_000
+
+  disable_ddl_transaction!
+  restrict_gitlab_migration gitlab_schema: :gitlab_main
+
+  def up
+    queue_batched_background_migration(
+      MIGRATION,
+      :project_mirror_data,
+      :id,
+      job_interval: INTERVAL,
+      batch_size: BATCH_SIZE,
+      sub_batch_size: SUB_BATCH_SIZE
+    )
+  end
+
+  def down
+    delete_batched_background_migration(MIGRATION, :project_mirror_data, :id, [])
+  end
+end
diff --git a/db/schema_migrations/20230208131808 b/db/schema_migrations/20230208131808
new file mode 100644
index 0000000000..24c5b21f6a
--- /dev/null
+++ b/db/schema_migrations/20230208131808
@@ -0,0 +1 @@
+784f8f189eee7b5cf3136f0a859874a1d170d2b148f4c260f968b144816f1322
\ No newline at end of file
diff --git a/glfm_specification/output_example_snapshots/snapshot_spec.html b/glfm_specification/output_example_snapshots/snapshot_spec.html
index 415ad1d0b1..73e1cd0a23 100644
--- a/glfm_specification/output_example_snapshots/snapshot_spec.html
+++ b/glfm_specification/output_example_snapshots/snapshot_spec.html
@@ -7028,7 +7028,7 @@ references and their corresponding code points.</p>
 <copy-code></copy-code>
 </div>
 <div class="gl-relative markdown-code-block js-markdown-code">
-<pre data-sourcepos="7591:1-7595:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">&lt;p&gt;  &amp;amp; © Æ Ď</span>
+<pre data-sourcepos="7591:1-7595:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">&lt;p&gt;  &amp;amp; © Æ Ď</span>
 <span id="LC2" class="line" lang="plaintext">¾ ℋ ⅆ</span>
 <span id="LC3" class="line" lang="plaintext">∲ ≧̸&lt;/p&gt;</span></code></pre>
 <copy-code></copy-code>
@@ -7344,11 +7344,11 @@ stripped in this way:</p>
 <div>
 <div><a href="#example-343">Example 343</a></div>
 <div class="gl-relative markdown-code-block js-markdown-code">
-<pre data-sourcepos="7960:1-7962:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="example" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">` b `</span></code></pre>
+<pre data-sourcepos="7960:1-7962:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="example" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">` b `</span></code></pre>
 <copy-code></copy-code>
 </div>
 <div class="gl-relative markdown-code-block js-markdown-code">
-<pre data-sourcepos="7964:1-7966:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">&lt;p&gt;&lt;code&gt; b &lt;/code&gt;&lt;/p&gt;</span></code></pre>
+<pre data-sourcepos="7964:1-7966:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">&lt;p&gt;&lt;code&gt; b &lt;/code&gt;&lt;/p&gt;</span></code></pre>
 <copy-code></copy-code>
 </div>
 </div>
@@ -7356,12 +7356,12 @@ stripped in this way:</p>
 <div>
 <div><a href="#example-344">Example 344</a></div>
 <div class="gl-relative markdown-code-block js-markdown-code">
-<pre data-sourcepos="7974:1-7977:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="example" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">` `</span>
+<pre data-sourcepos="7974:1-7977:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="example" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">` `</span>
 <span id="LC2" class="line" lang="plaintext">`  `</span></code></pre>
 <copy-code></copy-code>
 </div>
 <div class="gl-relative markdown-code-block js-markdown-code">
-<pre data-sourcepos="7979:1-7982:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">&lt;p&gt;&lt;code&gt; &lt;/code&gt;</span>
+<pre data-sourcepos="7979:1-7982:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">&lt;p&gt;&lt;code&gt; &lt;/code&gt;</span>
 <span id="LC2" class="line" lang="plaintext">&lt;code&gt;  &lt;/code&gt;&lt;/p&gt;</span></code></pre>
 <copy-code></copy-code>
 </div>
@@ -7832,11 +7832,11 @@ not part of a [left-flanking delimiter run]:</p>
 <div>
 <div><a href="#example-363">Example 363</a></div>
 <div class="gl-relative markdown-code-block js-markdown-code">
-<pre data-sourcepos="8485:1-8487:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="example" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">* a *</span></code></pre>
+<pre data-sourcepos="8485:1-8487:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="example" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">* a *</span></code></pre>
 <copy-code></copy-code>
 </div>
 <div class="gl-relative markdown-code-block js-markdown-code">
-<pre data-sourcepos="8489:1-8491:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">&lt;p&gt;* a *&lt;/p&gt;</span></code></pre>
+<pre data-sourcepos="8489:1-8491:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">&lt;p&gt;* a *&lt;/p&gt;</span></code></pre>
 <copy-code></copy-code>
 </div>
 </div>
@@ -9790,7 +9790,7 @@ Other [Unicode whitespace] like non-breaking space doesn't work.</p>
 <div>
 <div><a href="#example-515">Example 515</a></div>
 <div class="gl-relative markdown-code-block js-markdown-code">
-<pre data-sourcepos="10823:1-10825:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="example" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">[link](/url "title")</span></code></pre>
+<pre data-sourcepos="10823:1-10825:32" lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="example" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">[link](/url "title")</span></code></pre>
 <copy-code></copy-code>
 </div>
 <div class="gl-relative markdown-code-block js-markdown-code">
diff --git a/lib/api/repositories.rb b/lib/api/repositories.rb
index 70535496b1..6f8d34ea38 100644
--- a/lib/api/repositories.rb
+++ b/lib/api/repositories.rb
@@ -203,6 +203,10 @@ module API
           render_api_error!("Target project id:#{params[:from_project_id]} is not a fork of project id:#{params[:id]}", 400)
         end
 
+        unless can?(current_user, :read_code, target_project)
+          forbidden!("You don't have access to this fork's parent project")
+        end
+
         cache_key = compare_cache_key(current_user, user_project, target_project, declared_params)
 
         cache_action(cache_key, expires_in: 1.minute) do
diff --git a/lib/banzai/filter/inline_observability_filter.rb b/lib/banzai/filter/inline_observability_filter.rb
index 334c04f2b5..883965ccae 100644
--- a/lib/banzai/filter/inline_observability_filter.rb
+++ b/lib/banzai/filter/inline_observability_filter.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+require 'uri'
 
 module Banzai
   module Filter
@@ -15,7 +16,8 @@ module Banzai
         doc.document.create_element(
           'div',
           class: 'js-render-observability',
-          'data-frame-url': url
+          'data-frame-url': url,
+          'data-observability-url': Gitlab::Observability.observability_url
         )
       end
 
@@ -28,8 +30,15 @@ module Banzai
       # obtained from the target link
       def element_to_embed(node)
         url = node['href']
+        uri = URI.parse(url)
+        observability_uri = URI.parse(Gitlab::Observability.observability_url)
 
-        create_element(url)
+        if uri.scheme == observability_uri.scheme &&
+            uri.port == observability_uri.port &&
+            uri.host.casecmp?(observability_uri.host) &&
+            uri.path.downcase.exclude?("auth/start")
+          create_element(url)
+        end
       end
 
       private
diff --git a/lib/extracts_ref.rb b/lib/extracts_ref.rb
index f22996df0a..23f93ad131 100644
--- a/lib/extracts_ref.rb
+++ b/lib/extracts_ref.rb
@@ -5,7 +5,8 @@
 # Can be extended for different types of repository object, e.g. Project or Snippet
 module ExtractsRef
   InvalidPathError = Class.new(StandardError)
-
+  BRANCH_REF_TYPE = 'heads'
+  TAG_REF_TYPE = 'tags'
   # Given a string containing both a Git tree-ish, such as a branch or tag, and
   # a filesystem path joined by forward slashes, attempts to separate the two.
   #
@@ -91,7 +92,7 @@ module ExtractsRef
   def ref_type
     return unless params[:ref_type].present?
 
-    params[:ref_type] == 'tags' ? 'tags' : 'heads'
+    params[:ref_type] == TAG_REF_TYPE ? TAG_REF_TYPE : BRANCH_REF_TYPE
   end
 
   private
@@ -154,4 +155,13 @@ module ExtractsRef
   def repository_container
     raise NotImplementedError
   end
+
+  def ambiguous_ref?(project, ref)
+    return true if project.repository.ambiguous_ref?(ref)
+
+    return false unless ref&.starts_with?('refs/')
+
+    unprefixed_ref = ref.sub(%r{^refs/(heads|tags)/}, '')
+    project.repository.commit(unprefixed_ref).present?
+  end
 end
diff --git a/lib/gitlab/background_migration/nullify_last_error_from_project_mirror_data.rb b/lib/gitlab/background_migration/nullify_last_error_from_project_mirror_data.rb
new file mode 100644
index 0000000000..6ea5c17353
--- /dev/null
+++ b/lib/gitlab/background_migration/nullify_last_error_from_project_mirror_data.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module BackgroundMigration
+    # Nullifies last_error value from project_mirror_data table as they
+    # potentially included sensitive data.
+    # https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/3041
+    class NullifyLastErrorFromProjectMirrorData < BatchedMigrationJob
+      feature_category :source_code_management
+      operation_name :update_all
+
+      def perform
+        each_sub_batch { |rel| rel.update_all(last_error: nil) }
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/unicode.rb b/lib/gitlab/unicode.rb
index b49c5647da..f291ea1b4e 100644
--- a/lib/gitlab/unicode.rb
+++ b/lib/gitlab/unicode.rb
@@ -9,6 +9,12 @@ module Gitlab
     # https://idiosyncratic-ruby.com/41-proper-unicoding.html
     BIDI_REGEXP = /\p{Bidi Control}/.freeze
 
+    # Regular expression for identifying space characters
+    #
+    # In web browsers space characters can be confused with simple
+    # spaces which may be misleading
+    SPACE_REGEXP = /\p{Space_Separator}/.freeze
+
     class << self
       # Warning message used to highlight bidi characters in the GUI
       def bidi_warning
diff --git a/lib/gitlab/url_sanitizer.rb b/lib/gitlab/url_sanitizer.rb
index e3bf11b00b..da078cc7b9 100644
--- a/lib/gitlab/url_sanitizer.rb
+++ b/lib/gitlab/url_sanitizer.rb
@@ -2,15 +2,37 @@
 
 module Gitlab
   class UrlSanitizer
+    include Gitlab::Utils::StrongMemoize
+
     ALLOWED_SCHEMES = %w[http https ssh git].freeze
     ALLOWED_WEB_SCHEMES = %w[http https].freeze
+    SCHEMIFIED_SCHEME = 'glschemelessuri'
+    SCHEMIFY_PLACEHOLDER = "#{SCHEMIFIED_SCHEME}://"
+    # URI::DEFAULT_PARSER.make_regexp will only match URLs with schemes or
+    # relative URLs. This section will match schemeless URIs with userinfo
+    # e.g. user:pass@gitlab.com but will not match scp-style URIs e.g.
+    # user@server:path/to/file)
+    #
+    # The userinfo part is very loose compared to URI's implementation so we
+    # also match non-escaped userinfo e.g foo:b?r@gitlab.com which should be
+    # encoded as foo:b%3Fr@gitlab.com
+    URI_REGEXP = %r{
+    (?:
+       #{URI::DEFAULT_PARSER.make_regexp(ALLOWED_SCHEMES)}
+     |
+       (?:(?:(?!@)[%#{URI::REGEXP::PATTERN::UNRESERVED}#{URI::REGEXP::PATTERN::RESERVED}])+(?:@))
+       (?# negative lookahead ensures this isn't an SCP-style URL: [host]:[rel_path|abs_path] server:path/to/file)
+       (?!#{URI::REGEXP::PATTERN::HOST}:(?:#{URI::REGEXP::PATTERN::REL_PATH}|#{URI::REGEXP::PATTERN::ABS_PATH}))
+       #{URI::REGEXP::PATTERN::HOSTPORT}
+    )
+    }x.freeze
 
     def self.sanitize(content)
-      regexp = URI::DEFAULT_PARSER.make_regexp(ALLOWED_SCHEMES)
-
-      content.gsub(regexp) { |url| new(url).masked_url }
-    rescue Addressable::URI::InvalidURIError
-      content.gsub(regexp, '')
+      content.gsub(URI_REGEXP) do |url|
+        new(url).masked_url
+      rescue Addressable::URI::InvalidURIError
+        ''
+      end
     end
 
     def self.valid?(url, allowed_schemes: ALLOWED_SCHEMES)
@@ -37,17 +59,6 @@ module Gitlab
       @url = parse_url(url)
     end
 
-    def sanitized_url
-      @sanitized_url ||= safe_url.to_s
-    end
-
-    def masked_url
-      url = @url.dup
-      url.password = "*****" if url.password.present?
-      url.user = "*****" if url.user.present?
-      url.to_s
-    end
-
     def credentials
       @credentials ||= { user: @url.user.presence, password: @url.password.presence }
     end
@@ -56,15 +67,37 @@ module Gitlab
       credentials[:user]
     end
 
-    def full_url
-      @full_url ||= generate_full_url.to_s
+    def sanitized_url
+      safe_url = @url.dup
+      safe_url.password = nil
+      safe_url.user = nil
+      reverse_schemify(safe_url.to_s)
     end
+    strong_memoize_attr :sanitized_url
+
+    def masked_url
+      url = @url.dup
+      url.password = "*****" if url.password.present?
+      url.user = "*****" if url.user.present?
+      reverse_schemify(url.to_s)
+    end
+    strong_memoize_attr :masked_url
+
+    def full_url
+      return reverse_schemify(@url.to_s) unless valid_credentials?
+
+      url = @url.dup
+      url.password = encode_percent(credentials[:password]) if credentials[:password].present?
+      url.user = encode_percent(credentials[:user]) if credentials[:user].present?
+      reverse_schemify(url.to_s)
+    end
+    strong_memoize_attr :full_url
 
     private
 
     def parse_url(url)
-      url             = url.to_s.strip
-      match           = url.match(%r{\A(?:git|ssh|http(?:s?))\://(?:(.+)(?:@))?(.+)})
+      url = schemify(url.to_s.strip)
+      match = url.match(%r{\A(?:(?:#{SCHEMIFIED_SCHEME}|git|ssh|http(?:s?)):)?//(?:(.+)(?:@))?(.+)}o)
       raw_credentials = match[1] if match
 
       if raw_credentials.present?
@@ -83,24 +116,19 @@ module Gitlab
       url
     end
 
-    def generate_full_url
-      return @url unless valid_credentials?
-
-      @url.dup.tap do |generated|
-        generated.password = encode_percent(credentials[:password]) if credentials[:password].present?
-        generated.user = encode_percent(credentials[:user]) if credentials[:user].present?
-      end
+    def schemify(url)
+      # Prepend the placeholder scheme unless the URL has a scheme or is relative
+      url.prepend(SCHEMIFY_PLACEHOLDER) unless url.starts_with?(%r{(?:#{URI::REGEXP::PATTERN::SCHEME}:)?//}o)
+      url
     end
 
-    def safe_url
-      safe_url = @url.dup
-      safe_url.password = nil
-      safe_url.user = nil
-      safe_url
+    def reverse_schemify(url)
+      url.slice!(SCHEMIFY_PLACEHOLDER) if url.starts_with?(SCHEMIFY_PLACEHOLDER)
+      url
     end
 
     def valid_credentials?
-      credentials && credentials.is_a?(Hash) && credentials.any?
+      credentials.is_a?(Hash) && credentials.values.any?
     end
 
     def encode_percent(string)
diff --git a/lib/rouge/formatters/html_gitlab.rb b/lib/rouge/formatters/html_gitlab.rb
index 436739bed1..a7e95a96b8 100644
--- a/lib/rouge/formatters/html_gitlab.rb
+++ b/lib/rouge/formatters/html_gitlab.rb
@@ -25,7 +25,10 @@ module Rouge
           yield %(<span id="LC#{@line_number}" class="line" lang="#{@tag}">)
 
           line.each do |token, value|
-            yield highlight_unicode_control_characters(span(token, value.chomp! || value))
+            value = value.chomp! || value
+            value = replace_space_characters(value)
+
+            yield highlight_unicode_control_characters(span(token, value))
           end
 
           yield ellipsis if @ellipsis_indexes.include?(@line_number - 1) && @ellipsis_svg.present?
@@ -42,6 +45,10 @@ module Rouge
         %(<span class="gl-px-2 gl-rounded-base gl-mx-2 gl-bg-gray-100 gl-cursor-help has-tooltip" title="Content has been trimmed">#{@ellipsis_svg}</span>)
       end
 
+      def replace_space_characters(text)
+        text.gsub(Gitlab::Unicode::SPACE_REGEXP, ' ')
+      end
+
       def highlight_unicode_control_characters(text)
         text.gsub(Gitlab::Unicode::BIDI_REGEXP) do |char|
           %(<span class="unicode-bidi has-tooltip" data-toggle="tooltip" title="#{Gitlab::Unicode.bidi_warning}">#{char}</span>)
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index ae06cb3ae7..f8626094af 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -42005,6 +42005,9 @@ msgstr ""
 msgid "The default branch for this project has been changed. Please update your bookmarks."
 msgstr ""
 
+msgid "The default branch of this project clashes with another ref"
+msgstr ""
+
 msgid "The dependency list details information about the components used within your project."
 msgstr ""
 
diff --git a/spec/controllers/admin/hooks_controller_spec.rb b/spec/controllers/admin/hooks_controller_spec.rb
index 4101bd7f65..4e68ffdda2 100644
--- a/spec/controllers/admin/hooks_controller_spec.rb
+++ b/spec/controllers/admin/hooks_controller_spec.rb
@@ -59,6 +59,7 @@ RSpec.describe Admin::HooksController do
         enable_ssl_verification: false,
         url_variables: [
           { key: 'token', value: 'some secret value' },
+          { key: 'baz', value: 'qux' },
           { key: 'foo', value: nil }
         ]
       }
@@ -71,7 +72,7 @@ RSpec.describe Admin::HooksController do
       expect(flash[:notice]).to include('was updated')
       expect(hook).to have_attributes(hook_params.except(:url_variables))
       expect(hook).to have_attributes(
-        url_variables: { 'token' => 'some secret value', 'baz' => 'woo' }
+        url_variables: { 'token' => 'some secret value', 'baz' => 'qux' }
       )
     end
   end
diff --git a/spec/controllers/concerns/confirm_email_warning_spec.rb b/spec/controllers/concerns/confirm_email_warning_spec.rb
index 334c156e1a..b8a4b94aa6 100644
--- a/spec/controllers/concerns/confirm_email_warning_spec.rb
+++ b/spec/controllers/concerns/confirm_email_warning_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe ConfirmEmailWarning do
+RSpec.describe ConfirmEmailWarning, feature_category: :system_access do
   before do
     stub_feature_flags(soft_email_confirmation: true)
   end
@@ -82,6 +82,38 @@ RSpec.describe ConfirmEmailWarning do
             it { is_expected.to set_confirm_warning_for(user.email) }
           end
         end
+
+        context 'when user is being impersonated' do
+          let(:impersonator) { create(:admin) }
+
+          before do
+            allow(controller).to receive(:session).and_return({ impersonator_id: impersonator.id })
+
+            get :index
+          end
+
+          it { is_expected.to set_confirm_warning_for(user.email) }
+
+          context 'when impersonated user email has html in their email' do
+            let(:user) { create(:user, confirmed_at: nil, unconfirmed_email: "malicious@test.com<form><input/title='<script>alert(document.domain)</script>'>") }
+
+            it { is_expected.to set_confirm_warning_for("malicious@test.com&lt;form&gt;&lt;input/title=&#39;&lt;script&gt;alert(document.domain)&lt;/script&gt;&#39;&gt;") }
+          end
+        end
+
+        context 'when user is not being impersonated' do
+          before do
+            get :index
+          end
+
+          it { is_expected.to set_confirm_warning_for(user.email) }
+
+          context 'when user email has html in their email' do
+            let(:user) { create(:user, confirmed_at: nil, unconfirmed_email: "malicious@test.com<form><input/title='<script>alert(document.domain)</script>'>") }
+
+            it { is_expected.to set_confirm_warning_for("malicious@test.com&lt;form&gt;&lt;input/title=&#39;&lt;script&gt;alert(document.domain)&lt;/script&gt;&#39;&gt;") }
+          end
+        end
       end
     end
   end
diff --git a/spec/controllers/projects/blob_controller_spec.rb b/spec/controllers/projects/blob_controller_spec.rb
index 887a5ba598..ec92d92e2a 100644
--- a/spec/controllers/projects/blob_controller_spec.rb
+++ b/spec/controllers/projects/blob_controller_spec.rb
@@ -2,15 +2,16 @@
 
 require 'spec_helper'
 
-RSpec.describe Projects::BlobController do
+RSpec.describe Projects::BlobController, feature_category: :source_code_management do
   include ProjectForksHelper
 
   let(:project) { create(:project, :public, :repository, previous_default_branch: previous_default_branch) }
   let(:previous_default_branch) { nil }
 
   describe "GET show" do
-    def request
-      get(:show, params: { namespace_id: project.namespace, project_id: project, id: id })
+    let(:params) { { namespace_id: project.namespace, project_id: project, id: id } }
+    let(:request) do
+      get(:show, params: params)
     end
 
     render_views
@@ -18,10 +19,34 @@ RSpec.describe Projects::BlobController do
     context 'with file path' do
       before do
         expect(::Gitlab::GitalyClient).to receive(:allow_ref_name_caching).and_call_original
-
+        project.repository.add_tag(project.creator, 'ambiguous_ref', RepoHelpers.sample_commit.id)
+        project.repository.add_branch(project.creator, 'ambiguous_ref', RepoHelpers.another_sample_commit.id)
         request
       end
 
+      context 'when the ref is ambiguous' do
+        let(:ref) { 'ambiguous_ref' }
+        let(:path) { 'README.md' }
+        let(:id) { "#{ref}/#{path}" }
+        let(:params) { { namespace_id: project.namespace, project_id: project, id: id, ref_type: ref_type } }
+
+        context 'and explicitly requesting a branch' do
+          let(:ref_type) { 'heads' }
+
+          it 'redirects to blob#show with sha for the branch' do
+            expect(response).to redirect_to(project_blob_path(project, "#{RepoHelpers.another_sample_commit.id}/#{path}"))
+          end
+        end
+
+        context 'and explicitly requesting a tag' do
+          let(:ref_type) { 'tags' }
+
+          it 'responds with success' do
+            expect(response).to be_ok
+          end
+        end
+      end
+
       context "valid branch, valid file" do
         let(:id) { 'master/README.md' }
 
diff --git a/spec/controllers/projects/clusters_controller_spec.rb b/spec/controllers/projects/clusters_controller_spec.rb
index 894f0f8354..64c7772652 100644
--- a/spec/controllers/projects/clusters_controller_spec.rb
+++ b/spec/controllers/projects/clusters_controller_spec.rb
@@ -7,7 +7,7 @@ RSpec.describe Projects::ClustersController do
   include GoogleApi::CloudPlatformHelpers
   include KubernetesHelpers
 
-  let_it_be(:project) { create(:project) }
+  let_it_be_with_reload(:project) { create(:project) }
 
   let(:user) { create(:user) }
 
@@ -140,6 +140,27 @@ RSpec.describe Projects::ClustersController do
           expect(response).to redirect_to(new_user_session_path)
         end
       end
+
+      context 'with a public project' do
+        before do
+          project.update!(visibility_level: Gitlab::VisibilityLevel::PUBLIC)
+          project.project_feature.update!(metrics_dashboard_access_level: ProjectFeature::ENABLED)
+        end
+
+        context 'with guest user' do
+          let(:prometheus_body) { nil }
+
+          before do
+            project.add_guest(user)
+          end
+
+          it 'returns 404' do
+            get :prometheus_proxy, params: prometheus_proxy_params
+
+            expect(response).to have_gitlab_http_status(:not_found)
+          end
+        end
+      end
     end
   end
 
diff --git a/spec/controllers/projects/environments/prometheus_api_controller_spec.rb b/spec/controllers/projects/environments/prometheus_api_controller_spec.rb
index 68d50cf19f..6b0c164e43 100644
--- a/spec/controllers/projects/environments/prometheus_api_controller_spec.rb
+++ b/spec/controllers/projects/environments/prometheus_api_controller_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 RSpec.describe Projects::Environments::PrometheusApiController do
   let_it_be(:user) { create(:user) }
-  let_it_be(:project) { create(:project) }
+  let_it_be_with_reload(:project) { create(:project) }
   let_it_be(:proxyable) { create(:environment, project: project) }
 
   before do
@@ -70,6 +70,27 @@ RSpec.describe Projects::Environments::PrometheusApiController do
           expect(response).to redirect_to(new_user_session_path)
         end
       end
+
+      context 'with a public project' do
+        before do
+          project.update!(visibility_level: Gitlab::VisibilityLevel::PUBLIC)
+          project.project_feature.update!(metrics_dashboard_access_level: ProjectFeature::ENABLED)
+        end
+
+        context 'with guest user' do
+          let(:prometheus_body) { nil }
+
+          before do
+            project.add_guest(user)
+          end
+
+          it 'returns 404' do
+            get :prometheus_proxy, params: prometheus_proxy_params
+
+            expect(response).to have_gitlab_http_status(:not_found)
+          end
+        end
+      end
     end
   end
 end
diff --git a/spec/controllers/projects/refs_controller_spec.rb b/spec/controllers/projects/refs_controller_spec.rb
index a7a8361ae2..e36eb1207c 100644
--- a/spec/controllers/projects/refs_controller_spec.rb
+++ b/spec/controllers/projects/refs_controller_spec.rb
@@ -31,7 +31,7 @@ RSpec.describe Projects::RefsController, feature_category: :source_code_manageme
         'tree'           | nil     | lazy { project_tree_path(project, id) }
         'tree'           | 'heads' | lazy { project_tree_path(project, id) }
         'blob'           | nil     | lazy { project_blob_path(project, id) }
-        'blob'           | 'heads' | lazy { project_blob_path(project, id) }
+        'blob'           | 'heads' | lazy { project_blob_path(project, id, ref_type: 'heads') }
         'graph'          | nil     | lazy { project_network_path(project, id) }
         'graph'          | 'heads' | lazy { project_network_path(project, id) }
         'graphs'         | nil     | lazy { project_graph_path(project, id) }
@@ -60,7 +60,7 @@ RSpec.describe Projects::RefsController, feature_category: :source_code_manageme
         'tree'           | nil     | lazy { project_tree_path(project, id) }
         'tree'           | 'heads' | lazy { project_tree_path(project, id) }
         'blob'           | nil     | lazy { project_blob_path(project, id) }
-        'blob'           | 'heads' | lazy { project_blob_path(project, id) }
+        'blob'           | 'heads' | lazy { project_blob_path(project, id, ref_type: 'heads') }
         'graph'          | nil     | lazy { project_network_path(project, id) }
         'graph'          | 'heads' | lazy { project_network_path(project, id, ref_type: 'heads') }
         'graphs'         | nil     | lazy { project_graph_path(project, id) }
diff --git a/spec/controllers/projects/tree_controller_spec.rb b/spec/controllers/projects/tree_controller_spec.rb
index 9bc3065b6d..37149e1d3c 100644
--- a/spec/controllers/projects/tree_controller_spec.rb
+++ b/spec/controllers/projects/tree_controller_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe Projects::TreeController do
+RSpec.describe Projects::TreeController, feature_category: :source_code_management do
   let(:project) { create(:project, :repository, previous_default_branch: previous_default_branch) }
   let(:previous_default_branch) { nil }
   let(:user) { create(:user) }
@@ -15,18 +15,41 @@ RSpec.describe Projects::TreeController do
   end
 
   describe "GET show" do
+    let(:params) do
+      {
+        namespace_id: project.namespace.to_param, project_id: project, id: id
+      }
+    end
+
     # Make sure any errors accessing the tree in our views bubble up to this spec
     render_views
 
     before do
       expect(::Gitlab::GitalyClient).to receive(:allow_ref_name_caching).and_call_original
+      project.repository.add_tag(project.creator, 'ambiguous_ref', RepoHelpers.sample_commit.id)
+      project.repository.add_branch(project.creator, 'ambiguous_ref', RepoHelpers.another_sample_commit.id)
+      get :show, params: params
+    end
 
-      get(:show,
-          params: {
-            namespace_id: project.namespace.to_param,
-            project_id: project,
-            id: id
-          })
+    context 'when the ref is ambiguous' do
+      let(:id) { 'ambiguous_ref' }
+      let(:params) { { namespace_id: project.namespace, project_id: project, id: id, ref_type: ref_type } }
+
+      context 'and explicitly requesting a branch' do
+        let(:ref_type) { 'heads' }
+
+        it 'redirects to blob#show with sha for the branch' do
+          expect(response).to redirect_to(project_tree_path(project, RepoHelpers.another_sample_commit.id))
+        end
+      end
+
+      context 'and explicitly requesting a tag' do
+        let(:ref_type) { 'tags' }
+
+        it 'responds with success' do
+          expect(response).to be_ok
+        end
+      end
     end
 
     context "valid branch, no path" do
diff --git a/spec/controllers/projects_controller_spec.rb b/spec/controllers/projects_controller_spec.rb
index bc58eaa1d6..8c81a1414c 100644
--- a/spec/controllers/projects_controller_spec.rb
+++ b/spec/controllers/projects_controller_spec.rb
@@ -163,6 +163,69 @@ RSpec.describe ProjectsController do
             expect(assigns(:notification_setting).level).to eq("watch")
           end
         end
+
+        context 'when there is a tag with the same name as the default branch' do
+          let_it_be(:tagged_project) { create(:project, :public, :custom_repo, files: ['somefile']) }
+          let(:tree_with_default_branch) do
+            branch = tagged_project.repository.find_branch(tagged_project.default_branch)
+            project_tree_path(tagged_project, branch.target)
+          end
+
+          before do
+            tagged_project.repository.create_file(
+              tagged_project.creator,
+              'file_for_tag',
+              'content for file',
+              message: "Automatically created file",
+              branch_name: 'branch-to-tag'
+            )
+
+            tagged_project.repository.add_tag(
+              tagged_project.creator,
+              tagged_project.default_branch, # tag name
+              'branch-to-tag' # target
+            )
+          end
+
+          it 'redirects to tree view for the default branch' do
+            get :show, params: { namespace_id: tagged_project.namespace, id: tagged_project }
+            expect(response).to redirect_to(tree_with_default_branch)
+          end
+        end
+
+        context 'when the default branch name can resolve to another ref' do
+          let!(:project_with_default_branch) do
+            create(:project, :public, :custom_repo, files: ['somefile']).tap do |p|
+              p.repository.create_branch("refs/heads/refs/heads/#{other_ref}", 'master')
+              p.change_head("refs/heads/#{other_ref}")
+            end.reload
+          end
+
+          let(:other_ref) { 'branch-name' }
+
+          context 'but there is no other ref' do
+            it 'responds with ok' do
+              get :show, params: { namespace_id: project_with_default_branch.namespace, id: project_with_default_branch }
+              expect(response).to be_ok
+            end
+          end
+
+          context 'and that other ref exists' do
+            let(:tree_with_default_branch) do
+              branch = project_with_default_branch.repository.find_branch(project_with_default_branch.default_branch)
+              project_tree_path(project_with_default_branch, branch.target)
+            end
+
+            before do
+              project_with_default_branch.repository.create_branch(other_ref, 'master')
+            end
+
+            it 'redirects to tree view for the default branch' do
+              get :show, params: { namespace_id: project_with_default_branch.namespace, id: project_with_default_branch }
+              expect(response).to redirect_to(tree_with_default_branch)
+            end
+          end
+        end
       end
 
       describe "when project repository is disabled" do
diff --git a/spec/factories/project_hooks.rb b/spec/factories/project_hooks.rb
index 946b3925ee..d84e287d76 100644
--- a/spec/factories/project_hooks.rb
+++ b/spec/factories/project_hooks.rb
@@ -7,7 +7,7 @@ FactoryBot.define do
     project
 
     trait :url_variables do
-      url_variables { { 'abc' => 'supers3cret' } }
+      url_variables { { 'abc' => 'supers3cret', 'def' => 'foobar' } }
     end
 
     trait :token do
diff --git a/spec/features/admin/users/user_spec.rb b/spec/features/admin/users/user_spec.rb
index 1552d4e618..6612961722 100644
--- a/spec/features/admin/users/user_spec.rb
+++ b/spec/features/admin/users/user_spec.rb
@@ -271,6 +271,36 @@ RSpec.describe 'Admin::Users::User', feature_category: :user_management do
           icon = first('[data-testid="incognito-icon"]')
           expect(icon).not_to be nil
         end
+
+        context 'when viewing the confirm email warning', :js do
+          let_it_be(:another_user) { create(:user, :unconfirmed) }
+
+          let(:warning_alert) { page.find(:css, '[data-testid="alert-warning"]') }
+          let(:expected_styling) { { 'pointer-events' => 'none', 'cursor' => 'default' } }
+
+          context 'with an email that does not contain HTML' do
+            before do
+              subject
+            end
+
+            it 'displays the warning alert including the email' do
+              expect(warning_alert.text).to include("Please check your email (#{another_user.email}) to verify")
+            end
+          end
+
+          context 'with an email that contains HTML' do
+            let(:malicious_email) { "malicious@test.com<form><input/title='<script>alert(document.domain)</script>'>" }
+            let(:another_user) { create(:user, confirmed_at: nil, unconfirmed_email: malicious_email) }
+
+            before do
+              subject
+            end
+
+            it 'displays the impersonation alert, excludes email, and disables links' do
+              expect(warning_alert.text).to include("check your email (#{another_user.unconfirmed_email}) to verify")
+            end
+          end
+        end
       end
 
       context 'ending impersonation' do
diff --git a/spec/finders/environments/environment_names_finder_spec.rb b/spec/finders/environments/environment_names_finder_spec.rb
index 438f9e9ea7..c2336c5911 100644
--- a/spec/finders/environments/environment_names_finder_spec.rb
+++ b/spec/finders/environments/environment_names_finder_spec.rb
@@ -6,6 +6,7 @@ RSpec.describe Environments::EnvironmentNamesFinder do
   describe '#execute' do
     let!(:group) { create(:group) }
     let!(:public_project) { create(:project, :public, namespace: group) }
+    let_it_be_with_reload(:public_project_with_private_environments) { create(:project, :public) }
     let!(:private_project) { create(:project, :private, namespace: group) }
     let!(:user) { create(:user) }
 
@@ -14,6 +15,11 @@ RSpec.describe Environments::EnvironmentNamesFinder do
       create(:environment, name: 'gprd', project: public_project)
       create(:environment, name: 'gprd', project: private_project)
       create(:environment, name: 'gcny', project: private_project)
+      create(:environment, name: 'gprivprd', project: public_project_with_private_environments)
+      create(:environment, name: 'gprivstg', project: public_project_with_private_environments)
+
+      public_project_with_private_environments.update!(namespace: group)
+      public_project_with_private_environments.project_feature.update!(environments_access_level: Featurable::PRIVATE)
     end
 
     context 'using a group' do
@@ -23,7 +29,7 @@ RSpec.describe Environments::EnvironmentNamesFinder do
 
           names = described_class.new(group, user).execute
 
-          expect(names).to eq(%w[gcny gprd gstg])
+          expect(names).to eq(%w[gcny gprd gprivprd gprivstg gstg])
         end
       end
 
@@ -33,7 +39,7 @@ RSpec.describe Environments::EnvironmentNamesFinder do
 
           names = described_class.new(group, user).execute
 
-          expect(names).to eq(%w[gcny gprd gstg])
+          expect(names).to eq(%w[gcny gprd gprivprd gprivstg gstg])
         end
       end
 
@@ -57,8 +63,18 @@ RSpec.describe Environments::EnvironmentNamesFinder do
         end
       end
 
+      context 'with a public project reporter which has private environments' do
+        it 'returns environment names for public projects' do
+          public_project_with_private_environments.add_reporter(user)
+
+          names = described_class.new(group, user).execute
+
+          expect(names).to eq(%w[gprd gprivprd gprivstg gstg])
+        end
+      end
+
       context 'with a group guest' do
-        it 'returns environment names for all public projects' do
+        it 'returns environment names for public projects' do
           group.add_guest(user)
 
           names = described_class.new(group, user).execute
@@ -68,7 +84,7 @@ RSpec.describe Environments::EnvironmentNamesFinder do
       end
 
       context 'with a non-member' do
-        it 'returns environment names for all public projects' do
+        it 'returns environment names for only public projects with public environments' do
           names = described_class.new(group, user).execute
 
           expect(names).to eq(%w[gprd gstg])
@@ -76,7 +92,7 @@ RSpec.describe Environments::EnvironmentNamesFinder do
       end
 
       context 'without a user' do
-        it 'returns environment names for all public projects' do
+        it 'returns environment names for only public projects with public environments' do
           names = described_class.new(group).execute
 
           expect(names).to eq(%w[gprd gstg])
diff --git a/spec/finders/notes_finder_spec.rb b/spec/finders/notes_finder_spec.rb
index 792a14e306..1255a88211 100644
--- a/spec/finders/notes_finder_spec.rb
+++ b/spec/finders/notes_finder_spec.rb
@@ -106,6 +106,26 @@ RSpec.describe NotesFinder do
       end
     end
 
+    context 'for notes on public issue in public project' do
+      let_it_be(:public_project) { create(:project, :public) }
+      let_it_be(:guest_member) { create(:user) }
+      let_it_be(:reporter_member) { create(:user) }
+      let_it_be(:guest_project_member) { create(:project_member, :guest, user: guest_member, project: public_project) }
+      let_it_be(:reporter_project_member) { create(:project_member, :reporter, user: reporter_member, project: public_project) }
+      let_it_be(:internal_note) { create(:note_on_issue, project: public_project, internal: true) }
+      let_it_be(:public_note) { create(:note_on_issue, project: public_project) }
+
+      it 'shows all notes when the current_user has reporter access' do
+        notes = described_class.new(reporter_member, project: public_project).execute
+        expect(notes).to contain_exactly internal_note, public_note
+      end
+
+      it 'shows only public notes when the current_user has guest access' do
+        notes = described_class.new(guest_member, project: public_project).execute
+        expect(notes).to contain_exactly public_note
+      end
+    end
+
     context 'for target type' do
       let(:project) { create(:project, :repository) }
       let!(:note1) { create :note_on_issue, project: project }
diff --git a/spec/fixtures/emails/valid_reply_signed_smime.eml b/spec/fixtures/emails/valid_reply_signed_smime.eml
index 0c5e2c439a..965d922c95 100644
--- a/spec/fixtures/emails/valid_reply_signed_smime.eml
+++ b/spec/fixtures/emails/valid_reply_signed_smime.eml
@@ -1,294 +1,294 @@
-User-Agent: Microsoft-MacOutlook/10.22.0.200209
-Date: Mon, 17 Feb 2020 22:56:47 +0100
-Subject: Re: htmltest | test issue (#1)
-From: "Louzan Martinez, Diego (ext) (SI BP R&D ZG)"
- <diego.louzan.ext@siemens.com>
-To: Administrator / htmltest
- <dlouzan.dummy+c034670b1623e617e15a3df64223d363@gmail.com>
-Message-ID: <012E37D9-2A3F-4AC8-B79A-871F42914D86@siemens.com>
-Thread-Topic: htmltest | test issue (#1)
-References: <reply-c034670b1623e617e15a3df64223d363@169.254.169.254>
- <issue_451@169.254.169.254>
- <note_1797@169.254.169.254>
-In-Reply-To: <note_1797@169.254.169.254>
-Content-type: multipart/signed;
-	protocol="application/pkcs7-signature";
-	micalg=sha256;
-	boundary="B_3664825007_1904734766"
-MIME-Version: 1.0
-
---B_3664825007_1904734766
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-Me too, with an attachment
-
-=20
-
-From: Administrator <dlouzan.dummy@gmail.com>
-Reply to: Administrator / htmltest <dlouzan.dummy+c034670b1623e617e15a3df64=
-223d363@gmail.com>
-Date: Monday, 17 February 2020 at 22:55
-To: "Louzan Martinez, Diego (ext) (SOP IT STG XS)" <diego.louzan.ext@siemen=
-s.com>
-Subject: Re: htmltest | test issue (#1)
-
-=20
-
-Administrator commented:=20
-
-I pity the foo !!!
-
-=E2=80=94=20
-Reply to this email directly or view it on GitLab.=20
-You're receiving this email because of your account on 169.254.169.254. If =
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-s-microsoft-com:office:word" xmlns:m=3D"http://schemas.microsoft.com/office/20=
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-ction1><p class=3DMsoNormal><span lang=3DEN-US style=3D'mso-fareast-language:EN-US=
-'>Me too, with an attachment<o:p></o:p></span></p><p class=3DMsoNormal><span s=
-tyle=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div style=3D'bo=
-rder:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=
-=3DMsoNormal><b><span style=3D'font-size:12.0pt;color:black'>From: </span></b><s=
-pan style=3D'font-size:12.0pt;color:black'>Administrator &lt;dlouzan.dummy@gma=
-il.com&gt;<br><b>Reply to: </b>Administrator / htmltest &lt;dlouzan.dummy+c0=
-34670b1623e617e15a3df64223d363@gmail.com&gt;<br><b>Date: </b>Monday, 17 Febr=
-uary 2020 at 22:55<br><b>To: </b>&quot;Louzan Martinez, Diego (ext) (SOP IT =
-STG XS)&quot; &lt;diego.louzan.ext@siemens.com&gt;<br><b>Subject: </b>Re: ht=
-mltest | test issue (#1)<o:p></o:p></span></p></div><div><p class=3DMsoNormal>=
-<o:p>&nbsp;</o:p></p></div><div><p><span style=3D'color:#777777'><a href=3D"http=
-://localhost:3000/root">Administrator</a> commented: <o:p></o:p></span></p><=
-div><p>I pity the foo !!!<o:p></o:p></p></div></div><div style=3D'margin-top:7=
-.5pt'><p><span style=3D'font-size:12.0pt;color:#777777'>=E2=80=94 <br>Reply to this =
-email directly or <a href=3D"http://localhost:3000/root/htmltest/issues/1#note=
-_1797">view it on GitLab</a>. <br>You're receiving this email because of you=
-r account on 169.254.169.254. If you'd like to receive fewer emails, you can=
- <a href=3D"http://localhost:3000/sent_notifications/c034670b1623e617e15a3df64=
-223d363/unsubscribe">unsubscribe</a> from this thread or adjust your notific=
-ation settings. <o:p></o:p></span></p></div></div></body></html>
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---B_3664825007_1904734766--
+User-Agent: Microsoft-MacOutlook/10.22.0.200209
+Date: Mon, 17 Feb 2020 22:56:47 +0100
+Subject: Re: htmltest | test issue (#1)
+From: "Louzan Martinez, Diego (ext) (SI BP R&D ZG)"
+ <diego.louzan.ext@siemens.com>
+To: Administrator / htmltest
+ <dlouzan.dummy+c034670b1623e617e15a3df64223d363@gmail.com>
+Message-ID: <012E37D9-2A3F-4AC8-B79A-871F42914D86@siemens.com>
+Thread-Topic: htmltest | test issue (#1)
+References: <reply-c034670b1623e617e15a3df64223d363@169.254.169.254>
+ <issue_451@169.254.169.254>
+ <note_1797@169.254.169.254>
+In-Reply-To: <note_1797@169.254.169.254>
+Content-type: multipart/signed;
+	protocol="application/pkcs7-signature";
+	micalg=sha256;
+	boundary="B_3664825007_1904734766"
+MIME-Version: 1.0
+
+--B_3664825007_1904734766
+Content-type: multipart/mixed;
+	boundary="B_3664825007_384940722"
+
+
+--B_3664825007_384940722
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+	boundary="B_3664825007_1519466360"
+
+
+--B_3664825007_1519466360
+Content-type: text/plain;
+	charset="UTF-8"
+Content-transfer-encoding: quoted-printable
+
+Me too, with an attachment
+
+=20
+
+From: Administrator <dlouzan.dummy@gmail.com>
+Reply to: Administrator / htmltest <dlouzan.dummy+c034670b1623e617e15a3df64=
+223d363@gmail.com>
+Date: Monday, 17 February 2020 at 22:55
+To: "Louzan Martinez, Diego (ext) (SOP IT STG XS)" <diego.louzan.ext@siemen=
+s.com>
+Subject: Re: htmltest | test issue (#1)
+
+=20
+
+Administrator commented:=20
+
+I pity the foo !!!
+
+=E2=80=94=20
+Reply to this email directly or view it on GitLab.=20
+You're receiving this email because of your account on 169.254.169.254. If =
+you'd like to receive fewer emails, you can unsubscribe from this thread or =
+adjust your notification settings.=20
+
+
+--B_3664825007_1519466360
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+	charset="UTF-8"
+Content-transfer-encoding: quoted-printable
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+s-microsoft-com:office:word" xmlns:m=3D"http://schemas.microsoft.com/office/20=
+04/12/omml" xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta http-equiv=3DC=
+ontent-Type content=3D"text/html; charset=3Dutf-8"><meta name=3DGenerator content=3D=
+"Microsoft Word 15 (filtered medium)"><title>GitLab</title><style><!--
+/* Font Definitions */
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+	{font-family:"Cambria Math";
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+	panose-1:2 15 5 2 2 2 4 3 2 4;}
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+	margin-bottom:.0001pt;
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+	{page:WordSection1;}
+--></style></head><body lang=3Den-ES link=3Dblue vlink=3Dpurple><div class=3DWordSe=
+ction1><p class=3DMsoNormal><span lang=3DEN-US style=3D'mso-fareast-language:EN-US=
+'>Me too, with an attachment<o:p></o:p></span></p><p class=3DMsoNormal><span s=
+tyle=3D'mso-fareast-language:EN-US'><o:p>&nbsp;</o:p></span></p><div style=3D'bo=
+rder:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=
+=3DMsoNormal><b><span style=3D'font-size:12.0pt;color:black'>From: </span></b><s=
+pan style=3D'font-size:12.0pt;color:black'>Administrator &lt;dlouzan.dummy@gma=
+il.com&gt;<br><b>Reply to: </b>Administrator / htmltest &lt;dlouzan.dummy+c0=
+34670b1623e617e15a3df64223d363@gmail.com&gt;<br><b>Date: </b>Monday, 17 Febr=
+uary 2020 at 22:55<br><b>To: </b>&quot;Louzan Martinez, Diego (ext) (SOP IT =
+STG XS)&quot; &lt;diego.louzan.ext@siemens.com&gt;<br><b>Subject: </b>Re: ht=
+mltest | test issue (#1)<o:p></o:p></span></p></div><div><p class=3DMsoNormal>=
+<o:p>&nbsp;</o:p></p></div><div><p><span style=3D'color:#777777'><a href=3D"http=
+://localhost:3000/root">Administrator</a> commented: <o:p></o:p></span></p><=
+div><p>I pity the foo !!!<o:p></o:p></p></div></div><div style=3D'margin-top:7=
+.5pt'><p><span style=3D'font-size:12.0pt;color:#777777'>=E2=80=94 <br>Reply to this =
+email directly or <a href=3D"http://localhost:3000/root/htmltest/issues/1#note=
+_1797">view it on GitLab</a>. <br>You're receiving this email because of you=
+r account on 169.254.169.254. If you'd like to receive fewer emails, you can=
+ <a href=3D"http://localhost:3000/sent_notifications/c034670b1623e617e15a3df64=
+223d363/unsubscribe">unsubscribe</a> from this thread or adjust your notific=
+ation settings. <o:p></o:p></span></p></div></div></body></html>
+
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+
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+--B_3664825007_384940722--
+
+--B_3664825007_1904734766
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+Content-transfer-encoding: base64
+Content-disposition: attachment;
+	filename="smime.p7s"
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+
+--B_3664825007_1904734766--
diff --git a/spec/frontend/behaviors/markdown/render_observability_spec.js b/spec/frontend/behaviors/markdown/render_observability_spec.js
index c87d11742d..03a0cb2fcc 100644
--- a/spec/frontend/behaviors/markdown/render_observability_spec.js
+++ b/spec/frontend/behaviors/markdown/render_observability_spec.js
@@ -16,7 +16,7 @@ describe('Observability iframe renderer', () => {
   });
 
   it('renders an observability iframe', () => {
-    document.body.innerHTML = `<div class="js-render-observability" data-frame-url="https://observe.gitlab.com/"></div>`;
+    document.body.innerHTML = `<div class="js-render-observability" data-frame-url="https://observe.gitlab.com/"  data-observability-url="https://observe.gitlab.com/" ></div>`;
 
     expect(findObservabilityIframes()).toHaveLength(0);
 
@@ -26,7 +26,7 @@ describe('Observability iframe renderer', () => {
   });
 
   it('renders iframe with dark param when GL has dark theme', () => {
-    document.body.innerHTML = `<div class="js-render-observability" data-frame-url="https://observe.gitlab.com/"></div>`;
+    document.body.innerHTML = `<div class="js-render-observability" data-frame-url="https://observe.gitlab.com/" data-observability-url="https://observe.gitlab.com/"></div>`;
     jest.spyOn(ColorUtils, 'darkModeEnabled').mockImplementation(() => true);
 
     expect(findObservabilityIframes('dark')).toHaveLength(0);
@@ -35,4 +35,12 @@ describe('Observability iframe renderer', () => {
 
     expect(findObservabilityIframes('dark')).toHaveLength(1);
   });
+
+  it('does not render if url is different from observability url', () => {
+    document.body.innerHTML = `<div class="js-render-observability" data-frame-url="https://example.com/" data-observability-url="https://observe.gitlab.com/"></div>`;
+
+    renderEmbeddedObservability();
+
+    expect(findObservabilityIframes()).toHaveLength(0);
+  });
 });
diff --git a/spec/frontend/repository/utils/ref_switcher_utils_spec.js b/spec/frontend/repository/utils/ref_switcher_utils_spec.js
index 4d0250fffb..220dbf1739 100644
--- a/spec/frontend/repository/utils/ref_switcher_utils_spec.js
+++ b/spec/frontend/repository/utils/ref_switcher_utils_spec.js
@@ -1,5 +1,6 @@
 import { generateRefDestinationPath } from '~/repository/utils/ref_switcher_utils';
 import setWindowLocation from 'helpers/set_window_location_helper';
+import { TEST_HOST } from 'spec/test_constants';
 import { refWithSpecialCharMock, encodedRefWithSpecialCharMock } from '../mock_data';
 
 const projectRootPath = 'root/Project1';
@@ -16,14 +17,38 @@ describe('generateRefDestinationPath', () => {
     ${`${projectRootPath}/-/blob/${currentRef}/dir1/test.js`}           | ${`${projectRootPath}/-/blob/${selectedRef}/dir1/test.js`}
     ${`${projectRootPath}/-/blob/${currentRef}/dir1/dir2/test.js`}      | ${`${projectRootPath}/-/blob/${selectedRef}/dir1/dir2/test.js`}
     ${`${projectRootPath}/-/blob/${currentRef}/dir1/dir2/test.js#L123`} | ${`${projectRootPath}/-/blob/${selectedRef}/dir1/dir2/test.js#L123`}
-  `('generates the correct destination path for  $currentPath', ({ currentPath, result }) => {
+  `('generates the correct destination path for $currentPath', ({ currentPath, result }) => {
     setWindowLocation(currentPath);
-    expect(generateRefDestinationPath(projectRootPath, selectedRef)).toBe(result);
+    expect(generateRefDestinationPath(projectRootPath, currentRef, selectedRef)).toBe(
+      `${TEST_HOST}/${result}`,
+    );
+  });
+
+  describe('when using symbolic ref names', () => {
+    it.each`
+      currentPath                                                         | nextRef                                             | result
+      ${`${projectRootPath}/-/blob/${currentRef}/dir1/dir2/test.js#L123`} | ${'someHash'}                                       | ${`${projectRootPath}/-/blob/someHash/dir1/dir2/test.js#L123`}
+      ${`${projectRootPath}/-/blob/${currentRef}/dir1/dir2/test.js#L123`} | ${'refs/heads/prefixedByUseSymbolicRefNames'}       | ${`${projectRootPath}/-/blob/prefixedByUseSymbolicRefNames/dir1/dir2/test.js?ref_type=heads#L123`}
+      ${`${projectRootPath}/-/blob/${currentRef}/dir1/dir2/test.js#L123`} | ${'refs/tags/prefixedByUseSymbolicRefNames'}        | ${`${projectRootPath}/-/blob/prefixedByUseSymbolicRefNames/dir1/dir2/test.js?ref_type=tags#L123`}
+      ${`${projectRootPath}/-/tree/${currentRef}/dir1/dir2/test.js#L123`} | ${'refs/heads/prefixedByUseSymbolicRefNames'}       | ${`${projectRootPath}/-/tree/prefixedByUseSymbolicRefNames/dir1/dir2/test.js?ref_type=heads#L123`}
+      ${`${projectRootPath}/-/tree/${currentRef}/dir1/dir2/test.js#L123`} | ${'refs/tags/prefixedByUseSymbolicRefNames'}        | ${`${projectRootPath}/-/tree/prefixedByUseSymbolicRefNames/dir1/dir2/test.js?ref_type=tags#L123`}
+      ${`${projectRootPath}/-/tree/${currentRef}/dir1/dir2/test.js#L123`} | ${'refs/heads/refs/heads/branchNameContainsPrefix'} | ${`${projectRootPath}/-/tree/refs/heads/branchNameContainsPrefix/dir1/dir2/test.js?ref_type=heads#L123`}
+    `(
+      'generates the correct destination path for $currentPath with ref type when it can be extracted',
+      ({ currentPath, result, nextRef }) => {
+        setWindowLocation(currentPath);
+        expect(generateRefDestinationPath(projectRootPath, currentRef, nextRef)).toBe(
+          `${TEST_HOST}/${result}`,
+        );
+      },
+    );
   });
 
   it('encodes the selected ref', () => {
     const result = `${projectRootPath}/-/tree/${encodedRefWithSpecialCharMock}`;
 
-    expect(generateRefDestinationPath(projectRootPath, refWithSpecialCharMock)).toBe(result);
+    expect(generateRefDestinationPath(projectRootPath, currentRef, refWithSpecialCharMock)).toBe(
+      `${TEST_HOST}/${result}`,
+    );
   });
 });
diff --git a/spec/helpers/hooks_helper_spec.rb b/spec/helpers/hooks_helper_spec.rb
index 98a1f77b41..83d0a86eaa 100644
--- a/spec/helpers/hooks_helper_spec.rb
+++ b/spec/helpers/hooks_helper_spec.rb
@@ -26,7 +26,7 @@ RSpec.describe HooksHelper do
       it 'returns proper data' do
         expect(subject).to match(
           url: project_hook.url,
-          url_variables: Gitlab::Json.dump([{ key: 'abc' }])
+          url_variables: Gitlab::Json.dump([{ key: 'abc' }, { key: 'def' }])
         )
       end
     end
diff --git a/spec/lib/banzai/filter/inline_observability_filter_spec.rb b/spec/lib/banzai/filter/inline_observability_filter_spec.rb
index fb1ba46e76..69a9dc96c2 100644
--- a/spec/lib/banzai/filter/inline_observability_filter_spec.rb
+++ b/spec/lib/banzai/filter/inline_observability_filter_spec.rb
@@ -34,6 +34,58 @@ RSpec.describe Banzai::Filter::InlineObservabilityFilter do
       end
     end
 
+    context 'when the document contains an embeddable observability link with redirect' do
+      let(:url) { 'https://observe.gitlab.com@example.com/12345' }
+
+      it 'leaves the original link unchanged' do
+        expect(doc.at_css('a').to_s).to eq(input)
+      end
+
+      it 'does not append an observability charts placeholder' do
+        node = doc.at_css('.js-render-observability')
+
+        expect(node).not_to be_present
+      end
+    end
+
+    context 'when the document contains an embeddable observability link with different port' do
+      let(:url) { 'https://observe.gitlab.com:3000/12345' }
+      let(:observe_url) { 'https://observe.gitlab.com:3001' }
+
+      before do
+        stub_env('OVERRIDE_OBSERVABILITY_URL', observe_url)
+      end
+
+      it 'leaves the original link unchanged' do
+        expect(doc.at_css('a').to_s).to eq(input)
+      end
+
+      it 'does not append an observability charts placeholder' do
+        node = doc.at_css('.js-render-observability')
+
+        expect(node).not_to be_present
+      end
+    end
+
+    context 'when the document contains an embeddable observability link with auth/start' do
+      let(:url) { 'https://observe.gitlab.com/auth/start' }
+      let(:observe_url) { 'https://observe.gitlab.com' }
+
+      before do
+        stub_env('OVERRIDE_OBSERVABILITY_URL', observe_url)
+      end
+
+      it 'leaves the original link unchanged' do
+        expect(doc.at_css('a').to_s).to eq(input)
+      end
+
+      it 'does not append an observability charts placeholder' do
+        node = doc.at_css('.js-render-observability')
+
+        expect(node).not_to be_present
+      end
+    end
+
     context 'when feature flag is disabled' do
       let(:url) { 'https://observe.gitlab.com/12345' }
 
diff --git a/spec/lib/gitlab/background_migration/nullify_last_error_from_project_mirror_data_spec.rb b/spec/lib/gitlab/background_migration/nullify_last_error_from_project_mirror_data_spec.rb
new file mode 100644
index 0000000000..62f908ed79
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/nullify_last_error_from_project_mirror_data_spec.rb
@@ -0,0 +1,84 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::BackgroundMigration::NullifyLastErrorFromProjectMirrorData, feature_category: :source_code_management do # rubocop:disable Layout/LineLength
+  it 'nullifies last_error column on all rows' do
+    namespaces = table(:namespaces)
+    projects = table(:projects)
+    project_import_states = table(:project_mirror_data)
+
+    group = namespaces.create!(name: 'gitlab', path: 'gitlab-org')
+
+    project_namespace_1 = namespaces.create!(name: 'gitlab', path: 'gitlab-org')
+    project_namespace_2 = namespaces.create!(name: 'gitlab', path: 'gitlab-org')
+    project_namespace_3 = namespaces.create!(name: 'gitlab', path: 'gitlab-org')
+
+    project_1 = projects.create!(
+      namespace_id: group.id,
+      project_namespace_id: project_namespace_1.id,
+      name: 'test1'
+    )
+    project_2 = projects.create!(
+      namespace_id: group.id,
+      project_namespace_id: project_namespace_2.id,
+      name: 'test2'
+    )
+    project_3 = projects.create!(
+      namespace_id: group.id,
+      project_namespace_id: project_namespace_3.id,
+      name: 'test3'
+    )
+
+    project_import_state_1 = project_import_states.create!(
+      project_id: project_1.id,
+      status: 0,
+      last_update_started_at: 1.hour.ago,
+      last_update_scheduled_at: 1.hour.ago,
+      last_update_at: 1.hour.ago,
+      last_successful_update_at: 2.days.ago,
+      last_error: '13:fetch remote: "fatal: unable to look up user:pass@gitlab.com (port 9418) (nodename nor servname provided, or not known)\n": exit status 128.', # rubocop:disable Layout/LineLength
+      correlation_id_value: SecureRandom.uuid,
+      jid: SecureRandom.uuid
+    )
+
+    project_import_states.create!(
+      project_id: project_2.id,
+      status: 1,
+      last_update_started_at: 1.hour.ago,
+      last_update_scheduled_at: 1.hour.ago,
+      last_update_at: 1.hour.ago,
+      last_successful_update_at: nil,
+      next_execution_timestamp: 1.day.from_now,
+      last_error: '',
+      correlation_id_value: SecureRandom.uuid,
+      jid: SecureRandom.uuid
+    )
+
+    project_import_state_3 = project_import_states.create!(
+      project_id: project_3.id,
+      status: 2,
+      last_update_started_at: 1.hour.ago,
+      last_update_scheduled_at: 1.hour.ago,
+      last_update_at: 1.hour.ago,
+      last_successful_update_at: 1.hour.ago,
+      next_execution_timestamp: 1.day.from_now,
+      last_error: nil,
+      correlation_id_value: SecureRandom.uuid,
+      jid: SecureRandom.uuid
+    )
+
+    migration = described_class.new(
+      start_id: project_import_state_1.id,
+      end_id: project_import_state_3.id,
+      batch_table: :project_mirror_data,
+      batch_column: :id,
+      sub_batch_size: 1,
+      pause_ms: 0,
+      connection: ApplicationRecord.connection
+    )
+
+    w_last_error_count = -> { project_import_states.where.not(last_error: nil).count } # rubocop:disable CodeReuse/ActiveRecord
+    expect { migration.perform }.to change(&w_last_error_count).from(2).to(0)
+  end
+end
diff --git a/spec/lib/gitlab/url_sanitizer_spec.rb b/spec/lib/gitlab/url_sanitizer_spec.rb
index 0ffbf5f81e..c02cbef832 100644
--- a/spec/lib/gitlab/url_sanitizer_spec.rb
+++ b/spec/lib/gitlab/url_sanitizer_spec.rb
@@ -10,29 +10,36 @@ RSpec.describe Gitlab::UrlSanitizer do
       # We want to try with multi-line content because is how error messages are formatted
       described_class.sanitize(%Q{
          remote: Not Found
-         fatal: repository '#{url}' not found
+         fatal: repository `#{url}` not found
       })
     end
 
     where(:input, :output) do
-      'http://user:pass@test.com/root/repoC.git/'  | 'http://*****:*****@test.com/root/repoC.git/'
-      'https://user:pass@test.com/root/repoA.git/' | 'https://*****:*****@test.com/root/repoA.git/'
-      'ssh://user@host.test/path/to/repo.git'      | 'ssh://*****@host.test/path/to/repo.git'
-
-      # git protocol does not support authentication but clean any details anyway
-      'git://user:pass@host.test/path/to/repo.git' | 'git://*****:*****@host.test/path/to/repo.git'
-      'git://host.test/path/to/repo.git'           | 'git://host.test/path/to/repo.git'
+      # http(s), ssh, git, relative, and schemeless URLs should all be masked correctly
+      urls = ['http://', 'https://', 'ssh://', 'git://', '//', ''].flat_map do |protocol|
+        [
+          ["#{protocol}test.com", "#{protocol}test.com"],
+          ["#{protocol}test.com/", "#{protocol}test.com/"],
+          ["#{protocol}test.com/path/to/repo.git", "#{protocol}test.com/path/to/repo.git"],
+          ["#{protocol}user@test.com", "#{protocol}*****@test.com"],
+          ["#{protocol}user:pass@test.com", "#{protocol}*****:*****@test.com"],
+          ["#{protocol}user:@test.com", "#{protocol}*****@test.com"],
+          ["#{protocol}:pass@test.com", "#{protocol}:*****@test.com"]
+        ]
+      end
 
       # SCP-style URLs are left unmodified
-      'user@server:project.git'      | 'user@server:project.git'
-      'user:pass@server:project.git' | 'user:pass@server:project.git'
+      urls << ['user@server:project.git', 'user@server:project.git']
+      urls << ['user:@server:project.git', 'user:@server:project.git']
+      urls << [':pass@server:project.git', ':pass@server:project.git']
+      urls << ['user:pass@server:project.git', 'user:pass@server:project.git']
 
       # return an empty string for invalid URLs
-      'ssh://' | ''
+      urls << ['ssh://', '']
     end
 
     with_them do
-      it { expect(sanitize_url(input)).to include("repository '#{output}' not found") }
+      it { expect(sanitize_url(input)).to include("repository `#{output}` not found") }
     end
   end
 
diff --git a/spec/lib/rouge/formatters/html_gitlab_spec.rb b/spec/lib/rouge/formatters/html_gitlab_spec.rb
index 79bfdb262c..6fc1b395fc 100644
--- a/spec/lib/rouge/formatters/html_gitlab_spec.rb
+++ b/spec/lib/rouge/formatters/html_gitlab_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe Rouge::Formatters::HTMLGitlab do
+RSpec.describe Rouge::Formatters::HTMLGitlab, feature_category: :source_code_management do
   describe '#format' do
     subject { described_class.format(tokens, **options) }
 
@@ -67,5 +67,24 @@ RSpec.describe Rouge::Formatters::HTMLGitlab do
         is_expected.to include(%{<span class="unicode-bidi has-tooltip" data-toggle="tooltip" title="#{message}">}).exactly(4).times
       end
     end
+
+    context 'when space characters and zero-width spaces are used' do
+      let(:lang) { 'ruby' }
+      let(:tokens) { lexer.lex(code, continue: false) }
+
+      let(:code) do
+        <<~JS
+          def\u00a0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000hello
+        JS
+      end
+
+      it 'replaces the space characters with spaces' do
+        is_expected.to eq(
+          "<span id=\"LC1\" class=\"line\" lang=\"ruby\">" \
+          "<span class=\"k\">def</span><span class=\"err\">                </span><span class=\"n\">hello</span>" \
+          "</span>"
+        )
+      end
+    end
   end
 end
diff --git a/spec/migrations/nullify_last_error_from_project_mirror_data_spec.rb b/spec/migrations/nullify_last_error_from_project_mirror_data_spec.rb
new file mode 100644
index 0000000000..6c5679b674
--- /dev/null
+++ b/spec/migrations/nullify_last_error_from_project_mirror_data_spec.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+require_migration!
+
+RSpec.describe NullifyLastErrorFromProjectMirrorData, feature_category: :source_code_management do
+  let(:migration) { described_class::MIGRATION }
+
+  before do
+    migrate!
+  end
+
+  describe '#up' do
+    it 'schedules background jobs for each batch of projects' do
+      expect(migration).to(
+        have_scheduled_batched_migration(
+          table_name: :project_mirror_data,
+          column_name: :id,
+          interval: described_class::INTERVAL,
+          batch_size: described_class::BATCH_SIZE,
+          sub_batch_size: described_class::SUB_BATCH_SIZE
+        )
+      )
+    end
+  end
+
+  describe '#down' do
+    before do
+      schema_migrate_down!
+    end
+
+    it 'deletes all batched migration records' do
+      expect(migration).not_to have_scheduled_batched_migration
+    end
+  end
+end
diff --git a/spec/models/error_tracking/project_error_tracking_setting_spec.rb b/spec/models/error_tracking/project_error_tracking_setting_spec.rb
index d48f6f7f3e..26795c0ea7 100644
--- a/spec/models/error_tracking/project_error_tracking_setting_spec.rb
+++ b/spec/models/error_tracking/project_error_tracking_setting_spec.rb
@@ -302,7 +302,7 @@ RSpec.describe ErrorTracking::ProjectErrorTrackingSetting do
         it { expect(result[:issue].gitlab_commit_path).to eq(nil) }
       end
 
-      context 'when repo commit matches first relase version' do
+      context 'when repo commit matches first release version' do
         let(:commit) { instance_double(Commit, id: commit_id) }
         let(:repository) { instance_double(Repository, commit: commit) }
 
diff --git a/spec/models/hooks/web_hook_spec.rb b/spec/models/hooks/web_hook_spec.rb
index 75ff917c03..48d5b3b83c 100644
--- a/spec/models/hooks/web_hook_spec.rb
+++ b/spec/models/hooks/web_hook_spec.rb
@@ -242,6 +242,22 @@ RSpec.describe WebHook, feature_category: :integrations do
         expect(hook.url_variables).to eq({})
       end
 
+      it 'resets url variables if url is changed and url variables are appended' do
+        hook.url = 'http://suspicious.example.com/{abc}/{foo}'
+        hook.url_variables = hook.url_variables.merge('foo' => 'bar')
+
+        expect(hook).not_to be_valid
+        expect(hook.url_variables).to eq({})
+      end
+
+      it 'resets url variables if url is changed and url variables are removed' do
+        hook.url = 'http://suspicious.example.com/{abc}'
+        hook.url_variables = hook.url_variables.except("def")
+
+        expect(hook).not_to be_valid
+        expect(hook.url_variables).to eq({})
+      end
+
       it 'does not reset url variables if both url and url variables are changed' do
         hook.url = 'http://example.com/{one}/{two}'
         hook.url_variables = { 'one' => 'foo', 'two' => 'bar' }
@@ -249,6 +265,18 @@ RSpec.describe WebHook, feature_category: :integrations do
         expect(hook).to be_valid
         expect(hook.url_variables).to eq({ 'one' => 'foo', 'two' => 'bar' })
       end
+
+      context 'without url variables' do
+        subject(:hook) { build_stubbed(:project_hook, project: project, url: 'http://example.com') }
+
+        it 'does not reset url variables' do
+          hook.url = 'http://example.com/{one}/{two}'
+          hook.url_variables = { 'one' => 'foo', 'two' => 'bar' }
+
+          expect(hook).to be_valid
+          expect(hook.url_variables).to eq({ 'one' => 'foo', 'two' => 'bar' })
+        end
+      end
     end
 
     it "only consider these branch filter strategies are valid" do
diff --git a/spec/policies/project_policy_spec.rb b/spec/policies/project_policy_spec.rb
index a98f091b9f..52d1e70d7a 100644
--- a/spec/policies/project_policy_spec.rb
+++ b/spec/policies/project_policy_spec.rb
@@ -697,6 +697,39 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
     end
   end
 
+  describe 'read_prometheus', feature_category: :metrics do
+    using RSpec::Parameterized::TableSyntax
+
+    before do
+      project.project_feature.update!(metrics_dashboard_access_level: ProjectFeature::ENABLED)
+    end
+
+    let(:policy) { :read_prometheus }
+
+    where(:project_visibility, :role, :allowed) do
+      :public   | :anonymous | false
+      :public   | :guest     | false
+      :public   | :reporter  | true
+      :internal | :anonymous | false
+      :internal | :guest     | false
+      :internal | :reporter  | true
+      :private  | :anonymous | false
+      :private  | :guest     | false
+      :private  | :reporter  | true
+    end
+
+    with_them do
+      let(:current_user) { public_send(role) }
+      let(:project) { public_send("#{project_visibility}_project") }
+
+      if params[:allowed]
+        it { is_expected.to be_allowed(policy) }
+      else
+        it { is_expected.not_to be_allowed(policy) }
+      end
+    end
+  end
+
   describe 'update_max_artifacts_size' do
     context 'when no user' do
       let(:current_user) { anonymous }
@@ -972,7 +1005,7 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
           let(:current_user) { guest }
 
           it { is_expected.to be_allowed(:metrics_dashboard) }
-          it { is_expected.to be_allowed(:read_prometheus) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
           it { is_expected.to be_allowed(:read_deployment) }
           it { is_expected.to be_allowed(:read_metrics_user_starred_dashboard) }
           it { is_expected.to be_allowed(:create_metrics_user_starred_dashboard) }
@@ -982,7 +1015,7 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
           let(:current_user) { anonymous }
 
           it { is_expected.to be_allowed(:metrics_dashboard) }
-          it { is_expected.to be_allowed(:read_prometheus) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
           it { is_expected.to be_allowed(:read_deployment) }
           it { is_expected.to be_disallowed(:read_metrics_user_starred_dashboard) }
           it { is_expected.to be_disallowed(:create_metrics_user_starred_dashboard) }
@@ -1008,12 +1041,14 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
           let(:current_user) { guest }
 
           it { is_expected.to be_disallowed(:metrics_dashboard) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
         end
 
         context 'with anonymous' do
           let(:current_user) { anonymous }
 
           it { is_expected.to be_disallowed(:metrics_dashboard) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
         end
       end
 
@@ -1036,7 +1071,7 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
           let(:current_user) { guest }
 
           it { is_expected.to be_allowed(:metrics_dashboard) }
-          it { is_expected.to be_allowed(:read_prometheus) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
           it { is_expected.to be_allowed(:read_deployment) }
           it { is_expected.to be_allowed(:read_metrics_user_starred_dashboard) }
           it { is_expected.to be_allowed(:create_metrics_user_starred_dashboard) }
@@ -1046,6 +1081,7 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
           let(:current_user) { anonymous }
 
           it { is_expected.to be_disallowed(:metrics_dashboard) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
         end
       end
     end
@@ -1068,12 +1104,14 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
           let(:current_user) { guest }
 
           it { is_expected.to be_disallowed(:metrics_dashboard) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
         end
 
         context 'with anonymous' do
           let(:current_user) { anonymous }
 
           it { is_expected.to be_disallowed(:metrics_dashboard) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
         end
       end
 
@@ -1092,12 +1130,14 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
           let(:current_user) { guest }
 
           it { is_expected.to be_disallowed(:metrics_dashboard) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
         end
 
         context 'with anonymous' do
           let(:current_user) { anonymous }
 
           it { is_expected.to be_disallowed(:metrics_dashboard) }
+          it { is_expected.to be_disallowed(:read_prometheus) }
         end
       end
     end
@@ -2016,7 +2056,7 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
       :public   | ProjectFeature::ENABLED   | :anonymous  | true
       :public   | ProjectFeature::PRIVATE   | :maintainer | true
       :public   | ProjectFeature::PRIVATE   | :developer  | true
-      :public   | ProjectFeature::PRIVATE   | :guest      | true
+      :public   | ProjectFeature::PRIVATE   | :guest      | false
       :public   | ProjectFeature::PRIVATE   | :anonymous  | false
       :public   | ProjectFeature::DISABLED  | :maintainer | false
       :public   | ProjectFeature::DISABLED  | :developer  | false
@@ -2028,7 +2068,7 @@ RSpec.describe ProjectPolicy, feature_category: :authentication_and_authorizatio
       :internal | ProjectFeature::ENABLED   | :anonymous  | false
       :internal | ProjectFeature::PRIVATE   | :maintainer | true
       :internal | ProjectFeature::PRIVATE   | :developer  | true
-      :internal | ProjectFeature::PRIVATE   | :guest      | true
+      :internal | ProjectFeature::PRIVATE   | :guest      | false
       :internal | ProjectFeature::PRIVATE   | :anonymous  | false
       :internal | ProjectFeature::DISABLED  | :maintainer | false
       :internal | ProjectFeature::DISABLED  | :developer  | false
diff --git a/spec/requests/api/repositories_spec.rb b/spec/requests/api/repositories_spec.rb
index 555ba2bc97..be26fe2406 100644
--- a/spec/requests/api/repositories_spec.rb
+++ b/spec/requests/api/repositories_spec.rb
@@ -573,6 +573,22 @@ RSpec.describe API::Repositories, feature_category: :source_code_management do
     context 'when authenticated', 'as a developer' do
       it_behaves_like 'repository compare' do
         let(:current_user) { user }
+
+        context 'when user does not have read access to the parent project' do
+          let_it_be(:group) { create(:group) }
+          let(:forked_project) { fork_project(project, current_user, repository: true, namespace: group) }
+
+          before do
+            forked_project.add_guest(current_user)
+          end
+
+          it 'returns 403 error' do
+            get api(route, current_user), params: { from: 'improve/awesome', to: 'feature', from_project_id: forked_project.id }
+
+            expect(response).to have_gitlab_http_status(:forbidden)
+            expect(json_response['message']).to eq("403 Forbidden - You don't have access to this fork's parent project")
+          end
+        end
       end
     end
 
diff --git a/spec/services/merge_requests/push_options_handler_service_spec.rb b/spec/services/merge_requests/push_options_handler_service_spec.rb
index 251bf6f0d9..03f3d56cdd 100644
--- a/spec/services/merge_requests/push_options_handler_service_spec.rb
+++ b/spec/services/merge_requests/push_options_handler_service_spec.rb
@@ -861,6 +861,21 @@ RSpec.describe MergeRequests::PushOptionsHandlerService do
     end
   end
 
+  describe 'when user does not have access to target project' do
+    let(:push_options) { { create: true, target: 'my-branch' } }
+    let(:changes) { default_branch_changes }
+
+    before do
+      allow(user1).to receive(:can?).with(:read_code, project).and_return(false)
+    end
+
+    it 'records an error', :sidekiq_inline do
+      service.execute
+
+      expect(service.errors).to eq(["User access was denied"])
+    end
+  end
+
   describe 'when MRs are not enabled' do
     let(:project) { create(:project, :public, :repository).tap { |pr| pr.add_developer(user1) } }
     let(:push_options) { { create: true } }
diff --git a/spec/services/web_hook_service_spec.rb b/spec/services/web_hook_service_spec.rb
index 4b925a058e..bc11895a12 100644
--- a/spec/services/web_hook_service_spec.rb
+++ b/spec/services/web_hook_service_spec.rb
@@ -130,8 +130,8 @@ RSpec.describe WebHookService, :request_store, :clean_gitlab_redis_shared_state
       context 'there is userinfo' do
         before do
           project_hook.update!(
-            url: 'http://{one}:{two}@example.com',
-            url_variables: { 'one' => 'a', 'two' => 'b' }
+            url: 'http://{foo}:{bar}@example.com',
+            url_variables: { 'foo' => 'a', 'bar' => 'b' }
           )
           stub_full_request('http://example.com', method: :post)
         end
diff --git a/spec/views/explore/projects/page_out_of_bounds.html.haml_spec.rb b/spec/views/explore/projects/page_out_of_bounds.html.haml_spec.rb
new file mode 100644
index 0000000000..1ace28be5b
--- /dev/null
+++ b/spec/views/explore/projects/page_out_of_bounds.html.haml_spec.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'explore/projects/page_out_of_bounds.html.haml', feature_category: :projects do
+  let(:page_limit) { 10 }
+  let(:unsafe_param) { 'hacked_using_unsafe_param!' }
+
+  before do
+    assign(:max_page_number, page_limit)
+
+    controller.params[:action] = 'index'
+    controller.params[:host] = unsafe_param
+    controller.params[:protocol] = unsafe_param
+    controller.params[:sort] = 'name_asc'
+  end
+
+  it 'removes unsafe params from the link' do
+    render
+
+    href = "/explore/projects?page=#{page_limit}&sort=name_asc"
+    button_text = format(_("Back to page %{number}"), number: page_limit)
+    expect(rendered).to have_link(button_text, href: href)
+    expect(rendered).not_to include(unsafe_param)
+  end
+end