diff --git a/CHANGELOG.md b/CHANGELOG.md
index e520b162a2..ddb9a4fb0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,19 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 13.6.7 (2021-02-11)
+
+### Security (7 changes)
+
+- Cancel running and pending jobs when a project is deleted. !1220
+- Updates authorization for linting API.
+- Prevent exposure of confidential issue titles in file browser.
+- Check user access on API merge request read actions.
+- Prevent Denial of Service Attack on gitlab-shell.
+- Limit daily invitations to groups and projects.
+- Prevent Server-side Request Forgery for Prometheus when secured by Google IAP.
+
+
 ## 13.6.6 (2021-02-01)
 
 ### Security (5 changes)
diff --git a/GITALY_SERVER_VERSION b/GITALY_SERVER_VERSION
index 4c39112331..51067b9c1d 100644
--- a/GITALY_SERVER_VERSION
+++ b/GITALY_SERVER_VERSION
@@ -1 +1 @@
-13.6.6
\ No newline at end of file
+13.6.7
\ No newline at end of file
diff --git a/GITLAB_SHELL_VERSION b/GITLAB_SHELL_VERSION
index 0b704f2a43..4a60601836 100644
--- a/GITLAB_SHELL_VERSION
+++ b/GITLAB_SHELL_VERSION
@@ -1 +1 @@
-13.13.0
+13.13.1
diff --git a/VERSION b/VERSION
index 4c39112331..51067b9c1d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-13.6.6
\ No newline at end of file
+13.6.7
\ No newline at end of file
diff --git a/app/models/ci/pipeline.rb b/app/models/ci/pipeline.rb
index 8707d635e0..3778add83b 100644
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -15,6 +15,7 @@ module Ci
     include ShaAttribute
     include FromUnion
     include UpdatedAtFilterable
+    include EachBatch
 
     PROJECT_ROUTE_AND_NAMESPACE_ROUTE = {
       project: [:project_feature, :route, { namespace: :route }]
diff --git a/app/models/commit_status.rb b/app/models/commit_status.rb
index ee9c2501bf..f9de9dec07 100644
--- a/app/models/commit_status.rb
+++ b/app/models/commit_status.rb
@@ -55,6 +55,7 @@ class CommitStatus < ApplicationRecord
   scope :for_ids, -> (ids) { where(id: ids) }
   scope :for_ref, -> (ref) { where(ref: ref) }
   scope :by_name, -> (name) { where(name: name) }
+  scope :in_pipelines, ->(pipelines) { where(pipeline: pipelines) }
 
   scope :for_project_paths, -> (paths) do
     where(project: Project.where_full_path_in(Array(paths)))
diff --git a/app/models/member.rb b/app/models/member.rb
index 687830f526..3000c13f4b 100644
--- a/app/models/member.rb
+++ b/app/models/member.rb
@@ -45,6 +45,19 @@ class Member < ApplicationRecord
     },
     if: :project_bot?
 
+  scope :in_hierarchy, ->(source) do
+    groups = source.root_ancestor.self_and_descendants
+    group_members = Member.default_scoped.where(source: groups)
+
+    projects = source.root_ancestor.all_projects
+    project_members = Member.default_scoped.where(source: projects)
+
+    Member.default_scoped.from_union([
+      group_members,
+      project_members
+    ]).merge(self)
+  end
+
   # This scope encapsulates (most of) the conditions a row in the member table
   # must satisfy if it is a valid permission. Of particular note:
   #
@@ -77,12 +90,18 @@ class Member < ApplicationRecord
 
   scope :invite, -> { where.not(invite_token: nil) }
   scope :non_invite, -> { where(invite_token: nil) }
+
   scope :request, -> { where.not(requested_at: nil) }
   scope :non_request, -> { where(requested_at: nil) }
 
   scope :not_accepted_invitations, -> { invite.where(invite_accepted_at: nil) }
   scope :not_accepted_invitations_by_user, -> (user) { not_accepted_invitations.where(created_by: user) }
   scope :not_expired, -> (today = Date.current) { where(arel_table[:expires_at].gt(today).or(arel_table[:expires_at].eq(nil))) }
+
+  scope :created_today, -> do
+    now = Date.current
+    where(created_at: now.beginning_of_day..now.end_of_day)
+  end
   scope :last_ten_days_excluding_today, -> (today = Date.current) { where(created_at: (today - 10).beginning_of_day..(today - 1).end_of_day) }
 
   scope :has_access, -> { active.where('access_level > 0') }
diff --git a/app/models/project_services/prometheus_service.rb b/app/models/project_services/prometheus_service.rb
index d0e62a1afb..ab04322783 100644
--- a/app/models/project_services/prometheus_service.rb
+++ b/app/models/project_services/prometheus_service.rb
@@ -183,7 +183,17 @@ class PrometheusService < MonitoringService
     manual_configuration? && google_iap_audience_client_id.present? && google_iap_service_account_json.present?
   end
 
+  def clean_google_iap_service_account
+    return unless google_iap_service_account_json
+
+    google_iap_service_account_json
+      .then { |json| Gitlab::Json.parse(json) }
+      .except('token_credential_uri')
+  end
+
   def iap_client
-    @iap_client ||= Google::Auth::Credentials.new(Gitlab::Json.parse(google_iap_service_account_json), target_audience: google_iap_audience_client_id).client
+    @iap_client ||= Google::Auth::Credentials
+      .new(clean_google_iap_service_account, target_audience: google_iap_audience_client_id)
+      .client
   end
 end
diff --git a/app/services/ci/abort_project_pipelines_service.rb b/app/services/ci/abort_project_pipelines_service.rb
new file mode 100644
index 0000000000..d4f228e37a
--- /dev/null
+++ b/app/services/ci/abort_project_pipelines_service.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+module Ci
+  class AbortProjectPipelinesService
+    # Danger: Cancels in bulk without callbacks
+    # Only for pipeline abandonment scenarios (current example: project delete)
+    def execute(project)
+      return unless Feature.enabled?(:abort_deleted_project_pipelines, default_enabled: true)
+
+      pipelines = project.all_pipelines.cancelable
+      bulk_abort!(pipelines, status: :canceled)
+
+      ServiceResponse.success(message: 'Pipelines canceled')
+    end
+
+    private
+
+    def bulk_abort!(pipelines, status:)
+      pipelines.each_batch do |pipeline_batch|
+        CommitStatus.in_pipelines(pipeline_batch).in_batches.update_all(status: status) # rubocop: disable Cop/InBatches
+        pipeline_batch.update_all(status: status)
+      end
+    end
+  end
+end
diff --git a/app/services/ci/cancel_user_pipelines_service.rb b/app/services/ci/cancel_user_pipelines_service.rb
index 3a8b5e9108..3d3a8032e8 100644
--- a/app/services/ci/cancel_user_pipelines_service.rb
+++ b/app/services/ci/cancel_user_pipelines_service.rb
@@ -6,6 +6,7 @@ module Ci
     # This is a bug with CodeReuse/ActiveRecord cop
     # https://gitlab.com/gitlab-org/gitlab/issues/32332
     def execute(user)
+      # TODO: fix N+1 queries https://gitlab.com/gitlab-org/gitlab/-/issues/300685
       user.pipelines.cancelable.find_each(&:cancel_running)
 
       ServiceResponse.success(message: 'Pipeline canceled')
diff --git a/app/services/members/create_service.rb b/app/services/members/create_service.rb
index 088e6f031c..8dbf1ab1c9 100644
--- a/app/services/members/create_service.rb
+++ b/app/services/members/create_service.rb
@@ -2,12 +2,12 @@
 
 module Members
   class CreateService < Members::BaseService
+    include Gitlab::Utils::StrongMemoize
+
     DEFAULT_LIMIT = 100
 
     def execute(source)
-      return error(s_('AddMember|No users specified.')) if params[:user_ids].blank?
-
-      user_ids = params[:user_ids].split(',').uniq.flatten
+      return error(s_('AddMember|No users specified.')) if user_ids.blank?
 
       return error(s_("AddMember|Too many users specified (limit is %{user_limit})") % { user_limit: user_limit }) if
         user_limit && user_ids.size > user_limit
@@ -45,6 +45,13 @@ module Members
 
     private
 
+    def user_ids
+      strong_memoize(:user_ids) do
+        ids = params[:user_ids] || ''
+        ids.split(',').uniq.flatten
+      end
+    end
+
     def user_limit
       limit = params.fetch(:limit, DEFAULT_LIMIT)
 
diff --git a/app/services/projects/destroy_service.rb b/app/services/projects/destroy_service.rb
index bec7565753..c150162530 100644
--- a/app/services/projects/destroy_service.rb
+++ b/app/services/projects/destroy_service.rb
@@ -21,11 +21,14 @@ module Projects
     def execute
       return false unless can?(current_user, :remove_project, project)
 
+      project.update_attribute(:pending_delete, true)
       # Flush the cache for both repositories. This has to be done _before_
       # removing the physical repositories as some expiration code depends on
       # Git data (e.g. a list of branch names).
       flush_caches(project)
 
+      ::Ci::AbortProjectPipelinesService.new.execute(project)
+
       Projects::UnlinkForkService.new(project, current_user).execute
 
       attempt_destroy(project)
diff --git a/config/feature_flags/development/abort_deleted_project_pipelines.yml b/config/feature_flags/development/abort_deleted_project_pipelines.yml
new file mode 100644
index 0000000000..f09cc9dd86
--- /dev/null
+++ b/config/feature_flags/development/abort_deleted_project_pipelines.yml
@@ -0,0 +1,8 @@
+---
+name: abort_deleted_project_pipelines
+introduced_by_url: https://gitlab.com/gitlab-org/security/gitlab/-/merge_requests/1220
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/301106
+milestone: '13.9'
+type: development
+group: group::continuous integration
+default_enabled: true
diff --git a/config/feature_flags/development/codequality_mr_diff.yml b/config/feature_flags/development/codequality_mr_diff.yml
deleted file mode 100644
index ca6846b939..0000000000
--- a/config/feature_flags/development/codequality_mr_diff.yml
+++ /dev/null
@@ -1,8 +0,0 @@
----
-name: codequality_mr_diff
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/47938
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/284140
-milestone: '13.7'
-type: development
-group: group::testing
-default_enabled: false
diff --git a/db/migrate/20201007033527_add_daily_invites_to_plan_limits.rb b/db/migrate/20201007033527_add_daily_invites_to_plan_limits.rb
new file mode 100644
index 0000000000..8f0079cd63
--- /dev/null
+++ b/db/migrate/20201007033527_add_daily_invites_to_plan_limits.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class AddDailyInvitesToPlanLimits < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    add_column(:plan_limits, :daily_invites, :integer, default: 0, null: false)
+  end
+end
diff --git a/db/migrate/20201007033723_insert_daily_invites_plan_limits.rb b/db/migrate/20201007033723_insert_daily_invites_plan_limits.rb
new file mode 100644
index 0000000000..dcdcbbb096
--- /dev/null
+++ b/db/migrate/20201007033723_insert_daily_invites_plan_limits.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class InsertDailyInvitesPlanLimits < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    return unless Gitlab.com?
+
+    create_or_update_plan_limit('daily_invites', 'free', 20)
+    create_or_update_plan_limit('daily_invites', 'bronze', 0)
+    create_or_update_plan_limit('daily_invites', 'silver', 0)
+    create_or_update_plan_limit('daily_invites', 'gold', 0)
+  end
+
+  def down
+    return unless Gitlab.com?
+
+    create_or_update_plan_limit('daily_invites', 'free', 0)
+    create_or_update_plan_limit('daily_invites', 'bronze', 0)
+    create_or_update_plan_limit('daily_invites', 'silver', 0)
+    create_or_update_plan_limit('daily_invites', 'gold', 0)
+  end
+end
diff --git a/db/schema_migrations/20201007033527 b/db/schema_migrations/20201007033527
new file mode 100644
index 0000000000..b2cedd5797
--- /dev/null
+++ b/db/schema_migrations/20201007033527
@@ -0,0 +1 @@
+1200747265d5095a86250020786d6f1e9e50bc75328a71de497046807afa89d7
\ No newline at end of file
diff --git a/db/schema_migrations/20201007033723 b/db/schema_migrations/20201007033723
new file mode 100644
index 0000000000..c874ae0475
--- /dev/null
+++ b/db/schema_migrations/20201007033723
@@ -0,0 +1 @@
+febefead6f966960f6493d29add5f35fc4a1080b5118c5526502fa5fe1d29023
\ No newline at end of file
diff --git a/db/structure.sql b/db/structure.sql
index 1ed6ea64ec..ae84f8aa79 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -14732,7 +14732,8 @@ CREATE TABLE plan_limits (
     golang_max_file_size bigint DEFAULT 104857600 NOT NULL,
     debian_max_file_size bigint DEFAULT '3221225472'::bigint NOT NULL,
     project_feature_flags integer DEFAULT 200 NOT NULL,
-    ci_max_artifact_size_api_fuzzing integer DEFAULT 0 NOT NULL
+    ci_max_artifact_size_api_fuzzing integer DEFAULT 0 NOT NULL,
+    daily_invites integer DEFAULT 0 NOT NULL
 );
 
 CREATE SEQUENCE plan_limits_id_seq
diff --git a/doc/administration/instance_limits.md b/doc/administration/instance_limits.md
index ec56a59fdc..cfd9bccb24 100644
--- a/doc/administration/instance_limits.md
+++ b/doc/administration/instance_limits.md
@@ -96,6 +96,13 @@ Read more on the [Rack Attack initializer](../security/rack_attack.md) method of
 
 - **Default rate limit** - Disabled
 
+### Member Invitations
+
+Limit the maximum daily member invitations allowed per group hierarchy.
+
+- GitLab.com: Free members may invite 20 members per day.
+- Self-managed: Invites are not limited.
+
 ## Gitaly concurrency limit
 
 Clone traffic can put a large strain on your Gitaly service. To prevent such workloads from overwhelming your Gitaly server, you can set concurrency limits in Gitaly’s configuration file.
diff --git a/doc/user/project/integrations/prometheus.md b/doc/user/project/integrations/prometheus.md
index 97be16f8dd..b99f9e0947 100644
--- a/doc/user/project/integrations/prometheus.md
+++ b/doc/user/project/integrations/prometheus.md
@@ -182,6 +182,8 @@ service account can be found at Google's documentation for
    Prometheus OAuth Client secured with Google IAP.
 1. (Optional) In **Google IAP Service Account JSON**, provide the contents of the
    Service Account credentials file that is authorized to access the Prometheus resource.
+   The JSON key `token_credential_uri` is discarded to prevent
+   [Server-side Request Forgery (SSRF)](https://www.hackerone.com/blog-How-To-Server-Side-Request-Forgery-SSRF).
 1. Click **Save changes**.
 
 ![Configure Prometheus Service](img/prometheus_manual_configuration_v13_2.png)
diff --git a/lib/api/lint.rb b/lib/api/lint.rb
index 58181adaa9..c65c52e305 100644
--- a/lib/api/lint.rb
+++ b/lib/api/lint.rb
@@ -11,6 +11,8 @@ module API
         optional :include_merged_yaml, type: Boolean, desc: 'Whether or not to include merged CI config yaml in the response'
       end
       post '/lint' do
+        unauthorized! unless Gitlab::CurrentSettings.signup_enabled? && current_user
+
         result = Gitlab::Ci::YamlProcessor.new(params[:content], user: current_user).execute
         error = result.errors.first
 
@@ -56,7 +58,7 @@ module API
         optional :dry_run, type: Boolean, default: false, desc: 'Run pipeline creation simulation, or only do static check.'
       end
       post ':id/ci/lint' do
-        authorize! :download_code, user_project
+        authorize! :create_pipeline, user_project
 
         result = Gitlab::Ci::Lint
           .new(project: user_project, current_user: current_user)
diff --git a/lib/api/merge_request_approvals.rb b/lib/api/merge_request_approvals.rb
index 27ef0b9c7c..0d49647641 100644
--- a/lib/api/merge_request_approvals.rb
+++ b/lib/api/merge_request_approvals.rb
@@ -26,6 +26,8 @@ module API
         #   GET /projects/:id/merge_requests/:merge_request_iid/approvals
         desc 'List approvals for merge request'
         get 'approvals' do
+          not_found!("Merge Request") unless can?(current_user, :read_merge_request, user_project)
+
           merge_request = find_merge_request_with_access(params[:merge_request_iid])
 
           present_approval(merge_request)
diff --git a/lib/api/merge_request_diffs.rb b/lib/api/merge_request_diffs.rb
index 0ffb38438e..97a6c7075b 100644
--- a/lib/api/merge_request_diffs.rb
+++ b/lib/api/merge_request_diffs.rb
@@ -23,6 +23,8 @@ module API
         use :pagination
       end
       get ":id/merge_requests/:merge_request_iid/versions" do
+        not_found!("Merge Request") unless can?(current_user, :read_merge_request, user_project)
+
         merge_request = find_merge_request_with_access(params[:merge_request_iid])
 
         present paginate(merge_request.merge_request_diffs.order_id_desc), with: Entities::MergeRequestDiff
@@ -39,6 +41,8 @@ module API
       end
 
       get ":id/merge_requests/:merge_request_iid/versions/:version_id" do
+        not_found!("Merge Request") unless can?(current_user, :read_merge_request, user_project)
+
         merge_request = find_merge_request_with_access(params[:merge_request_iid])
 
         present merge_request.merge_request_diffs.find(params[:version_id]), with: Entities::MergeRequestDiffFull
diff --git a/lib/api/merge_requests.rb b/lib/api/merge_requests.rb
index d17e451093..ba90a249d1 100644
--- a/lib/api/merge_requests.rb
+++ b/lib/api/merge_requests.rb
@@ -243,6 +243,8 @@ module API
         success Entities::MergeRequest
       end
       get ':id/merge_requests/:merge_request_iid' do
+        not_found!("Merge Request") unless can?(current_user, :read_merge_request, user_project)
+
         merge_request = find_merge_request_with_access(params[:merge_request_iid])
 
         present merge_request,
@@ -259,7 +261,10 @@ module API
         success Entities::UserBasic
       end
       get ':id/merge_requests/:merge_request_iid/participants' do
+        not_found!("Merge Request") unless can?(current_user, :read_merge_request, user_project)
+
         merge_request = find_merge_request_with_access(params[:merge_request_iid])
+
         participants = ::Kaminari.paginate_array(merge_request.participants)
 
         present paginate(participants), with: Entities::UserBasic
@@ -269,6 +274,8 @@ module API
         success Entities::Commit
       end
       get ':id/merge_requests/:merge_request_iid/commits' do
+        not_found!("Merge Request") unless can?(current_user, :read_merge_request, user_project)
+
         merge_request = find_merge_request_with_access(params[:merge_request_iid])
 
         commits =
@@ -350,6 +357,8 @@ module API
         success Entities::MergeRequestChanges
       end
       get ':id/merge_requests/:merge_request_iid/changes' do
+        not_found!("Merge Request") unless can?(current_user, :read_merge_request, user_project)
+
         merge_request = find_merge_request_with_access(params[:merge_request_iid])
 
         present merge_request,
@@ -365,6 +374,8 @@ module API
       get ':id/merge_requests/:merge_request_iid/pipelines' do
         pipelines = merge_request_pipelines_with_access
 
+        not_found!("Merge Request") unless can?(current_user, :read_merge_request, user_project)
+
         present paginate(pipelines), with: Entities::Ci::PipelineBasic
       end
 
diff --git a/lib/api/todos.rb b/lib/api/todos.rb
index 03850ba1c4..afc1525cbe 100644
--- a/lib/api/todos.rb
+++ b/lib/api/todos.rb
@@ -28,6 +28,11 @@ module API
         end
         post ":id/#{type}/:#{type_id_str}/todo" do
           issuable = instance_exec(params[type_id_str], &finder)
+
+          unless can?(current_user, :read_merge_request, issuable.project)
+            not_found!(type.split("_").map(&:capitalize).join(" "))
+          end
+
           todo = TodoService.new.mark_todo(issuable, current_user).first
 
           if todo
diff --git a/lib/gitlab/ci/pipeline/chain/validate/abilities.rb b/lib/gitlab/ci/pipeline/chain/validate/abilities.rb
index 8f1e690c08..4f90b7756e 100644
--- a/lib/gitlab/ci/pipeline/chain/validate/abilities.rb
+++ b/lib/gitlab/ci/pipeline/chain/validate/abilities.rb
@@ -10,6 +10,10 @@ module Gitlab
             include Chain::Helpers
 
             def perform!
+              if project.pending_delete?
+                return error('Project is deleted!')
+              end
+
               unless project.builds_enabled?
                 return error('Pipelines are disabled!')
               end
diff --git a/lib/gitlab/tree_summary.rb b/lib/gitlab/tree_summary.rb
index 9b67599668..bc7b8bd2b9 100644
--- a/lib/gitlab/tree_summary.rb
+++ b/lib/gitlab/tree_summary.rb
@@ -40,21 +40,17 @@ module Gitlab
     #     - An Array of the unique ::Commit objects in the first value
     def summarize
       summary = contents
-        .map { |content| build_entry(content) }
         .tap { |summary| fill_last_commits!(summary) }
 
       [summary, commits]
     end
 
     def fetch_logs
-      cache_key = ['projects', project.id, 'logs', commit.id, path, offset]
-      Rails.cache.fetch(cache_key, expires_in: CACHE_EXPIRE_IN) do
-        logs, _ = summarize
+      logs, _ = summarize
 
-        new_offset = next_offset if more?
+      new_offset = next_offset if more?
 
-        [logs.as_json, new_offset]
-      end
+      [logs.as_json, new_offset]
     end
 
     # Does the tree contain more entries after the given offset + limit?
@@ -71,7 +67,7 @@ module Gitlab
     private
 
     def contents
-      all_contents[offset, limit]
+      all_contents[offset, limit] || []
     end
 
     def commits
@@ -82,22 +78,17 @@ module Gitlab
       project.repository
     end
 
+    # Ensure the path is in "path/" format
+    def ensured_path
+      File.join(*[path, ""]) if path
+    end
+
     def entry_path(entry)
       File.join(*[path, entry[:file_name]].compact).force_encoding(Encoding::ASCII_8BIT)
     end
 
-    def build_entry(entry)
-      { file_name: entry.name, type: entry.type }
-    end
-
     def fill_last_commits!(entries)
-      # Ensure the path is in "path/" format
-      ensured_path =
-        if path
-          File.join(*[path, ""])
-        end
-
-      commits_hsh = repository.list_last_commits_for_tree(commit.id, ensured_path, offset: offset, limit: limit, literal_pathspec: true)
+      commits_hsh = fetch_last_cached_commits_list
       prerender_commit_full_titles!(commits_hsh.values)
 
       entries.each do |entry|
@@ -112,6 +103,18 @@ module Gitlab
       end
     end
 
+    def fetch_last_cached_commits_list
+      cache_key = ['projects', project.id, 'last_commits_list', commit.id, ensured_path, offset, limit]
+
+      commits = Rails.cache.fetch(cache_key, expires_in: CACHE_EXPIRE_IN) do
+        repository
+          .list_last_commits_for_tree(commit.id, ensured_path, offset: offset, limit: limit, literal_pathspec: true)
+          .transform_values!(&:to_hash)
+      end
+
+      commits.transform_values! { |value| Commit.from_hash(value, project) }
+    end
+
     def cache_commit(commit)
       return unless commit.present?
 
@@ -123,12 +126,18 @@ module Gitlab
     end
 
     def all_contents
-      strong_memoize(:all_contents) do
+      strong_memoize(:all_contents) { cached_contents }
+    end
+
+    def cached_contents
+      cache_key = ['projects', project.id, 'content', commit.id, path]
+
+      Rails.cache.fetch(cache_key, expires_in: CACHE_EXPIRE_IN) do
         [
           *tree.trees,
           *tree.blobs,
           *tree.submodules
-        ]
+        ].map { |entry| { file_name: entry.name, type: entry.type } }
       end
     end
 
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 68643cb4a6..c7ed47a279 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -1762,6 +1762,9 @@ msgstr ""
 msgid "AddContextCommits|Add/remove"
 msgstr ""
 
+msgid "AddMember|Invite limit of %{daily_invites} per day exceeded"
+msgstr ""
+
 msgid "AddMember|No users specified."
 msgstr ""
 
diff --git a/spec/controllers/groups/group_links_controller_spec.rb b/spec/controllers/groups/group_links_controller_spec.rb
index c411d9cfb6..a2f7161ca4 100644
--- a/spec/controllers/groups/group_links_controller_spec.rb
+++ b/spec/controllers/groups/group_links_controller_spec.rb
@@ -9,6 +9,10 @@ RSpec.describe Groups::GroupLinksController do
   let(:group_member) { create(:user) }
   let!(:project) { create(:project, group: shared_group) }
 
+  around do |example|
+    travel_to DateTime.new(2019, 4, 1) { example.run }
+  end
+
   before do
     sign_in(user)
 
diff --git a/spec/controllers/groups/group_members_controller_spec.rb b/spec/controllers/groups/group_members_controller_spec.rb
index 5425a437c8..4d78419e8e 100644
--- a/spec/controllers/groups/group_members_controller_spec.rb
+++ b/spec/controllers/groups/group_members_controller_spec.rb
@@ -9,6 +9,10 @@ RSpec.describe Groups::GroupMembersController do
   let(:group) { create(:group, :public) }
   let(:membership) { create(:group_member, group: group) }
 
+  around do |example|
+    travel_to DateTime.new(2019, 4, 1) { example.run }
+  end
+
   describe 'GET index' do
     it 'renders index with 200 status code' do
       get :index, params: { group_id: group }
diff --git a/spec/controllers/projects/group_links_controller_spec.rb b/spec/controllers/projects/group_links_controller_spec.rb
index 3baadde46d..084a807e16 100644
--- a/spec/controllers/projects/group_links_controller_spec.rb
+++ b/spec/controllers/projects/group_links_controller_spec.rb
@@ -8,6 +8,10 @@ RSpec.describe Projects::GroupLinksController do
   let_it_be(:project) { create(:project, :private, group: group2) }
   let_it_be(:user) { create(:user) }
 
+  around do |example|
+    travel_to DateTime.new(2019, 4, 1) { example.run }
+  end
+
   before do
     project.add_maintainer(user)
     sign_in(user)
diff --git a/spec/controllers/projects/project_members_controller_spec.rb b/spec/controllers/projects/project_members_controller_spec.rb
index 74311fa89f..73b6d642be 100644
--- a/spec/controllers/projects/project_members_controller_spec.rb
+++ b/spec/controllers/projects/project_members_controller_spec.rb
@@ -7,6 +7,10 @@ RSpec.describe Projects::ProjectMembersController do
   let(:group) { create(:group, :public) }
   let(:project) { create(:project, :public) }
 
+  around do |example|
+    travel_to DateTime.new(2019, 4, 1) { example.run }
+  end
+
   describe 'GET index' do
     it 'has the project_members address with a 200 status code' do
       get :index, params: { namespace_id: project.namespace, project_id: project }
diff --git a/spec/controllers/projects/refs_controller_spec.rb b/spec/controllers/projects/refs_controller_spec.rb
index d10351feb9..b625ce35d6 100644
--- a/spec/controllers/projects/refs_controller_spec.rb
+++ b/spec/controllers/projects/refs_controller_spec.rb
@@ -56,18 +56,6 @@ RSpec.describe Projects::RefsController do
         expect(response).to be_successful
         expect(json_response).to be_kind_of(Array)
       end
-
-      it 'caches tree summary data', :use_clean_rails_memory_store_caching do
-        expect_next_instance_of(::Gitlab::TreeSummary) do |instance|
-          expect(instance).to receive_messages(summarize: ['logs'], next_offset: 50, more?: true)
-        end
-
-        xhr_get(:json, offset: 25)
-
-        cache_key = "projects/#{project.id}/logs/#{project.commit.id}/#{path}/25"
-        expect(Rails.cache.fetch(cache_key)).to eq(['logs', 50])
-        expect(response.headers['More-Logs-Offset']).to eq("50")
-      end
     end
   end
 end
diff --git a/spec/factories/project_members.rb b/spec/factories/project_members.rb
index 0c2ffac411..1ce07f3602 100644
--- a/spec/factories/project_members.rb
+++ b/spec/factories/project_members.rb
@@ -15,7 +15,7 @@ FactoryBot.define do
     trait(:invited) do
       user_id { nil }
       invite_token { 'xxx' }
-      invite_email { 'email@email.com' }
+      sequence(:invite_email) { |n| "email#{n}@email.com" }
     end
 
     trait :blocked do
diff --git a/spec/lib/gitlab/ci/pipeline/chain/validate/abilities_spec.rb b/spec/lib/gitlab/ci/pipeline/chain/validate/abilities_spec.rb
index ae3270cb9b..7aaeee32f4 100644
--- a/spec/lib/gitlab/ci/pipeline/chain/validate/abilities_spec.rb
+++ b/spec/lib/gitlab/ci/pipeline/chain/validate/abilities_spec.rb
@@ -74,6 +74,14 @@ RSpec.describe Gitlab::Ci::Pipeline::Chain::Validate::Abilities do
     it 'does not break the chain' do
       expect(step.break?).to eq false
     end
+
+    context 'when project is deleted' do
+      before do
+        project.update!(pending_delete: true)
+      end
+
+      specify { expect(step.perform!).to contain_exactly('Project is deleted!') }
+    end
   end
 
   describe '#allowed_to_write_ref?' do
diff --git a/spec/lib/gitlab/tree_summary_spec.rb b/spec/lib/gitlab/tree_summary_spec.rb
index 303a4a8058..d2c5844b0f 100644
--- a/spec/lib/gitlab/tree_summary_spec.rb
+++ b/spec/lib/gitlab/tree_summary_spec.rb
@@ -3,6 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe Gitlab::TreeSummary do
+  include RepoHelpers
   using RSpec::Parameterized::TableSyntax
 
   let(:project) { create(:project, :empty_repo) }
@@ -44,6 +45,40 @@ RSpec.describe Gitlab::TreeSummary do
         expect(commits).to match_array(entries.map { |entry| entry[:commit] })
       end
     end
+
+    context 'when offset is over the limit' do
+      let(:offset) { 100 }
+
+      it 'returns an empty array' do
+        expect(summarized).to eq([[], []])
+      end
+    end
+
+    context 'with caching', :use_clean_rails_memory_store_caching do
+      subject { Rails.cache.fetch(key) }
+
+      before do
+        summarized
+      end
+
+      context 'Repository tree cache' do
+        let(:key) { ['projects', project.id, 'content', commit.id, path] }
+
+        it 'creates a cache for repository content' do
+          is_expected.to eq([{ file_name: 'a.txt', type: :blob }])
+        end
+      end
+
+      context 'Commits list cache' do
+        let(:offset) { 0 }
+        let(:limit) { 25 }
+        let(:key) { ['projects', project.id, 'last_commits_list', commit.id, path, offset, limit] }
+
+        it 'creates a cache for commits list' do
+          is_expected.to eq('a.txt' => commit.to_hash)
+        end
+      end
+    end
   end
 
   describe '#summarize (entries)' do
@@ -167,6 +202,46 @@ RSpec.describe Gitlab::TreeSummary do
     end
   end
 
+  describe 'References in commit messages' do
+    let_it_be(:project) { create(:project, :empty_repo) }
+    let_it_be(:issue) { create(:issue, project: project) }
+    let(:entries) { summary.summarize.first }
+    let(:entry) { entries.find { |entry| entry[:file_name] == 'issue.txt' } }
+
+    before_all do
+      create_file_in_repo(project, 'master', 'master', 'issue.txt', '', commit_message: "Issue ##{issue.iid}")
+    end
+
+    where(:project_visibility, :user_role, :issue_confidential, :expected_result) do
+      'private'  | :guest    | false | true
+      'private'  | :guest    | true  | false
+      'private'  | :reporter | false | true
+      'private'  | :reporter | true  | true
+
+      'internal' | :guest    | false | true
+      'internal' | :guest    | true  | false
+      'internal' | :reporter | false | true
+      'internal' | :reporter | true  | true
+
+      'public'   | :guest    | false | true
+      'public'   | :guest    | true  | false
+      'public'   | :reporter | false | true
+      'public'   | :reporter | true  | true
+    end
+
+    with_them do
+      subject { entry[:commit_title_html].include?("title=\"#{issue.title}\"") }
+
+      before do
+        project.add_role(user, user_role)
+        project.update!(visibility_level: Gitlab::VisibilityLevel.level_value(project_visibility))
+        issue.update!(confidential: issue_confidential)
+      end
+
+      it { is_expected.to eq(expected_result) }
+    end
+  end
+
   describe '#more?' do
     let(:path) { 'tmp/more' }
 
diff --git a/spec/migrations/insert_daily_invites_plan_limits_spec.rb b/spec/migrations/insert_daily_invites_plan_limits_spec.rb
new file mode 100644
index 0000000000..3265efcb0c
--- /dev/null
+++ b/spec/migrations/insert_daily_invites_plan_limits_spec.rb
@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require Rails.root.join('db', 'migrate', '20201007033723_insert_daily_invites_plan_limits.rb')
+
+RSpec.describe InsertDailyInvitesPlanLimits do
+  let(:plans) { table(:plans) }
+  let(:plan_limits) { table(:plan_limits) }
+  let!(:free_plan) { plans.create!(name: 'free') }
+  let!(:bronze_plan) { plans.create!(name: 'bronze') }
+  let!(:silver_plan) { plans.create!(name: 'silver') }
+  let!(:gold_plan) { plans.create!(name: 'gold') }
+
+  context 'when on Gitlab.com' do
+    before do
+      expect(Gitlab).to receive(:com?).at_most(:twice).and_return(true)
+    end
+
+    it 'correctly migrates up and down' do
+      reversible_migration do |migration|
+        migration.before -> {
+          expect(plan_limits.where.not(daily_invites: 0)).to be_empty
+        }
+
+        # Expectations will run after the up migration.
+        migration.after -> {
+          expect(plan_limits.pluck(:plan_id, :daily_invites)).to contain_exactly(
+            [free_plan.id, 20],
+            [bronze_plan.id, 0],
+            [silver_plan.id, 0],
+            [gold_plan.id, 0]
+          )
+        }
+      end
+    end
+  end
+
+  context 'when on self hosted' do
+    before do
+      expect(Gitlab).to receive(:com?).at_most(:twice).and_return(false)
+    end
+
+    it 'correctly migrates up and down' do
+      reversible_migration do |migration|
+        migration.before -> {
+          expect(plan_limits.pluck(:daily_invites)).to eq []
+        }
+
+        migration.after -> {
+          expect(plan_limits.pluck(:daily_invites)).to eq []
+        }
+      end
+    end
+  end
+end
diff --git a/spec/models/ci/pipeline_spec.rb b/spec/models/ci/pipeline_spec.rb
index 1ca370dc95..4c26cc0965 100644
--- a/spec/models/ci/pipeline_spec.rb
+++ b/spec/models/ci/pipeline_spec.rb
@@ -34,6 +34,7 @@ RSpec.describe Ci::Pipeline, :mailer, factory_default: :keep do
   it { is_expected.to have_many(:auto_canceled_jobs) }
   it { is_expected.to have_many(:sourced_pipelines) }
   it { is_expected.to have_many(:triggered_pipelines) }
+  it { is_expected.to have_many(:pipeline_artifacts) }
 
   it { is_expected.to have_one(:chat_data) }
   it { is_expected.to have_one(:source_pipeline) }
@@ -41,14 +42,15 @@ RSpec.describe Ci::Pipeline, :mailer, factory_default: :keep do
   it { is_expected.to have_one(:source_job) }
   it { is_expected.to have_one(:pipeline_config) }
 
-  it { is_expected.to validate_presence_of(:sha) }
-  it { is_expected.to validate_presence_of(:status) }
-
   it { is_expected.to respond_to :git_author_name }
   it { is_expected.to respond_to :git_author_email }
   it { is_expected.to respond_to :short_sha }
   it { is_expected.to delegate_method(:full_path).to(:project).with_prefix }
-  it { is_expected.to have_many(:pipeline_artifacts) }
+
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:sha) }
+    it { is_expected.to validate_presence_of(:status) }
+  end
 
   describe 'associations' do
     it 'has a bidirectional relationship with projects' do
diff --git a/spec/models/member_spec.rb b/spec/models/member_spec.rb
index 1a791820f1..b60af7abad 100644
--- a/spec/models/member_spec.rb
+++ b/spec/models/member_spec.rb
@@ -171,6 +171,43 @@ RSpec.describe Member do
       end
     end
 
+    describe '.in_hierarchy' do
+      let(:root_ancestor) { create(:group) }
+      let(:project) { create(:project, group: root_ancestor) }
+      let(:subgroup) { create(:group, parent: root_ancestor) }
+      let(:subgroup_project) { create(:project, group: subgroup) }
+
+      let!(:root_ancestor_member) { create(:group_member, group: root_ancestor) }
+      let!(:project_member) { create(:project_member, project: project) }
+      let!(:subgroup_member) { create(:group_member, group: subgroup) }
+      let!(:subgroup_project_member) { create(:project_member, project: subgroup_project) }
+
+      let(:hierarchy_members) do
+        [
+          root_ancestor_member,
+          project_member,
+          subgroup_member,
+          subgroup_project_member
+        ]
+      end
+
+      subject { Member.in_hierarchy(project) }
+
+      it { is_expected.to contain_exactly(*hierarchy_members) }
+
+      context 'with scope prefix' do
+        subject { Member.where.not(source: project).in_hierarchy(subgroup) }
+
+        it { is_expected.to contain_exactly(root_ancestor_member, subgroup_member, subgroup_project_member) }
+      end
+
+      context 'with scope suffix' do
+        subject { Member.in_hierarchy(project).where.not(source: project) }
+
+        it { is_expected.to contain_exactly(root_ancestor_member, subgroup_member, subgroup_project_member) }
+      end
+    end
+
     describe '.invite' do
       it { expect(described_class.invite).not_to include @maintainer }
       it { expect(described_class.invite).to include @invited_member }
@@ -251,6 +288,21 @@ RSpec.describe Member do
       it { is_expected.to include(expiring_tomorrow, not_expiring) }
     end
 
+    describe '.created_today' do
+      let_it_be(:now) { Time.current }
+      let_it_be(:created_today) { create(:group_member, created_at: now.beginning_of_day) }
+      let_it_be(:created_yesterday) { create(:group_member, created_at: now - 1.day) }
+
+      before do
+        travel_to now
+      end
+
+      subject { described_class.created_today }
+
+      it { is_expected.not_to include(created_yesterday) }
+      it { is_expected.to include(created_today) }
+    end
+
     describe '.last_ten_days_excluding_today' do
       let_it_be(:now) { Time.current }
       let_it_be(:created_today) { create(:group_member, created_at: now.beginning_of_day) }
diff --git a/spec/models/plan_limits_spec.rb b/spec/models/plan_limits_spec.rb
index 67fb11f34e..4259c8b708 100644
--- a/spec/models/plan_limits_spec.rb
+++ b/spec/models/plan_limits_spec.rb
@@ -209,6 +209,7 @@ RSpec.describe PlanLimits do
         ci_pipeline_size
         ci_active_jobs
         storage_size_limit
+        daily_invites
       ] + disabled_max_artifact_size_columns
     end
 
diff --git a/spec/models/project_services/prometheus_service_spec.rb b/spec/models/project_services/prometheus_service_spec.rb
index 76fc5a826c..2813caae78 100644
--- a/spec/models/project_services/prometheus_service_spec.rb
+++ b/spec/models/project_services/prometheus_service_spec.rb
@@ -2,11 +2,13 @@
 
 require 'spec_helper'
 
+require 'googleauth'
+
 RSpec.describe PrometheusService, :use_clean_rails_memory_store_caching, :snowplow do
   include PrometheusHelpers
   include ReactiveCachingHelpers
 
-  let(:project) { create(:prometheus_project) }
+  let_it_be_with_reload(:project) { create(:prometheus_project) }
   let(:service) { project.prometheus_service }
 
   describe "Associations" do
@@ -256,19 +258,66 @@ RSpec.describe PrometheusService, :use_clean_rails_memory_store_caching, :snowpl
     context 'behind IAP' do
       let(:manual_configuration) { true }
 
-      before do
-        # dummy private key generated only for this test to pass openssl validation
-        service.google_iap_service_account_json = '{"type":"service_account","private_key":"-----BEGIN RSA PRIVATE KEY-----\nMIIBOAIBAAJAU85LgUY5o6j6j/07GMLCNUcWJOBA1buZnNgKELayA6mSsHrIv31J\nY8kS+9WzGPQninea7DcM4hHA7smMgQD1BwIDAQABAkAqKxMy6PL3tn7dFL43p0ex\nJyOtSmlVIiAZG1t1LXhE/uoLpYi5DnbYqGgu0oih+7nzLY/dXpNpXUmiRMOUEKmB\nAiEAoTi2rBXbrLSi2C+H7M/nTOjMQQDuZ8Wr4uWpKcjYJTMCIQCFEskL565oFl/7\nRRQVH+cARrAsAAoJSbrOBAvYZ0PI3QIgIEFwis10vgEF86rOzxppdIG/G+JL0IdD\n9IluZuXAGPECIGUo7qSaLr75o2VEEgwtAFH5aptIPFjrL5LFCKwtdB4RAiAYZgFV\nHCMmaooAw/eELuMoMWNYmujZ7VaAnOewGDW0uw==\n-----END RSA PRIVATE KEY-----\n"}'
-        service.google_iap_audience_client_id = "IAP_CLIENT_ID.apps.googleusercontent.com"
+      let(:google_iap_service_account) do
+        {
+          type: "service_account",
+          # dummy private key generated only for this test to pass openssl validation
+          private_key: <<~KEY
+            -----BEGIN RSA PRIVATE KEY-----
+            MIIBOAIBAAJAU85LgUY5o6j6j/07GMLCNUcWJOBA1buZnNgKELayA6mSsHrIv31J
+            Y8kS+9WzGPQninea7DcM4hHA7smMgQD1BwIDAQABAkAqKxMy6PL3tn7dFL43p0ex
+            JyOtSmlVIiAZG1t1LXhE/uoLpYi5DnbYqGgu0oih+7nzLY/dXpNpXUmiRMOUEKmB
+            AiEAoTi2rBXbrLSi2C+H7M/nTOjMQQDuZ8Wr4uWpKcjYJTMCIQCFEskL565oFl/7
+            RRQVH+cARrAsAAoJSbrOBAvYZ0PI3QIgIEFwis10vgEF86rOzxppdIG/G+JL0IdD
+            9IluZuXAGPECIGUo7qSaLr75o2VEEgwtAFH5aptIPFjrL5LFCKwtdB4RAiAYZgFV
+            HCMmaooAw/eELuMoMWNYmujZ7VaAnOewGDW0uw==
+            -----END RSA PRIVATE KEY-----
+          KEY
+        }
+      end
 
-        stub_request(:post, "https://oauth2.googleapis.com/token").to_return(status: 200, body: '{"id_token": "FOO"}', headers: { 'Content-Type': 'application/json; charset=UTF-8' })
+      def stub_iap_request
+        service.google_iap_service_account_json = Gitlab::Json.generate(google_iap_service_account)
+        service.google_iap_audience_client_id = 'IAP_CLIENT_ID.apps.googleusercontent.com'
+
+        stub_request(:post, 'https://oauth2.googleapis.com/token')
+          .to_return(
+            status: 200,
+            body: '{"id_token": "FOO"}',
+            headers: { 'Content-Type': 'application/json; charset=UTF-8' }
+          )
       end
 
       it 'includes the authorization header' do
+        stub_iap_request
+
         expect(service.prometheus_client).not_to be_nil
         expect(service.prometheus_client.send(:options)).to have_key(:headers)
         expect(service.prometheus_client.send(:options)[:headers]).to eq(authorization: "Bearer FOO")
       end
+
+      context 'when passed with token_credential_uri', issue: 'https://gitlab.com/gitlab-org/gitlab/-/issues/284819' do
+        let(:malicious_host) { 'http://example.com' }
+
+        where(:param_name) do
+          [
+            :token_credential_uri,
+            :tokencredentialuri,
+            :Token_credential_uri,
+            :tokenCredentialUri
+          ]
+        end
+
+        with_them do
+          it 'does not make any unexpected HTTP requests' do
+            google_iap_service_account[param_name] = malicious_host
+            stub_iap_request
+            stub_request(:any, malicious_host).to_raise('Making additional HTTP requests is forbidden!')
+
+            expect(service.prometheus_client).not_to be_nil
+          end
+        end
+      end
     end
   end
 
diff --git a/spec/requests/api/lint_spec.rb b/spec/requests/api/lint_spec.rb
index aecbcfb5b5..2316e702c3 100644
--- a/spec/requests/api/lint_spec.rb
+++ b/spec/requests/api/lint_spec.rb
@@ -4,91 +4,136 @@ require 'spec_helper'
 
 RSpec.describe API::Lint do
   describe 'POST /ci/lint' do
-    context 'with valid .gitlab-ci.yaml content' do
-      let(:yaml_content) do
-        File.read(Rails.root.join('spec/support/gitlab_stubs/gitlab_ci.yml'))
+    context 'when signup settings are disabled' do
+      Gitlab::CurrentSettings.signup_enabled = false
+
+      context 'when unauthenticated' do
+        it 'returns authentication error' do
+          post api('/ci/lint'), params: { content: 'content' }
+
+          expect(response).to have_gitlab_http_status(:unauthorized)
+        end
       end
 
-      it 'passes validation without warnings or errors' do
-        post api('/ci/lint'), params: { content: yaml_content }
+      context 'when authenticated' do
+        it 'returns unauthorized error' do
+          post api('/ci/lint'), params: { content: 'content' }
 
-        expect(response).to have_gitlab_http_status(:ok)
-        expect(json_response).to be_an Hash
-        expect(json_response['status']).to eq('valid')
-        expect(json_response['warnings']).to eq([])
-        expect(json_response['errors']).to eq([])
-      end
-
-      it 'outputs expanded yaml content' do
-        post api('/ci/lint'), params: { content: yaml_content, include_merged_yaml: true }
-
-        expect(response).to have_gitlab_http_status(:ok)
-        expect(json_response).to have_key('merged_yaml')
+          expect(response).to have_gitlab_http_status(:unauthorized)
+        end
       end
     end
 
-    context 'with valid .gitlab-ci.yaml with warnings' do
-      let(:yaml_content) { { job: { script: 'ls', rules: [{ when: 'always' }] } }.to_yaml }
+    context 'when signup settings are enabled' do
+      Gitlab::CurrentSettings.signup_enabled = true
 
-      it 'passes validation but returns warnings' do
-        post api('/ci/lint'), params: { content: yaml_content }
+      context 'when unauthenticated' do
+        it 'returns authentication error' do
+          post api('/ci/lint'), params: { content: 'content' }
 
-        expect(response).to have_gitlab_http_status(:ok)
-        expect(json_response['status']).to eq('valid')
-        expect(json_response['warnings']).not_to be_empty
-        expect(json_response['status']).to eq('valid')
-        expect(json_response['errors']).to eq([])
+          expect(response).to have_gitlab_http_status(:unauthorized)
+        end
       end
-    end
 
-    context 'with an invalid .gitlab_ci.yml' do
-      context 'with invalid syntax' do
-        let(:yaml_content) { 'invalid content' }
-
-        it 'responds with errors about invalid syntax' do
-          post api('/ci/lint'), params: { content: yaml_content }
+      context 'when authenticated' do
+        let_it_be(:api_user) { create(:user) }
+        it 'returns authentication success' do
+          post api('/ci/lint', api_user), params: { content: 'content' }
 
           expect(response).to have_gitlab_http_status(:ok)
-          expect(json_response['status']).to eq('invalid')
+        end
+      end
+    end
+
+    context 'when authenticated' do
+      let_it_be(:api_user) { create(:user) }
+
+      context 'with valid .gitlab-ci.yaml content' do
+        let(:yaml_content) do
+          File.read(Rails.root.join('spec/support/gitlab_stubs/gitlab_ci.yml'))
+        end
+
+        it 'passes validation without warnings or errors' do
+          post api('/ci/lint', api_user), params: { content: yaml_content }
+
+          expect(response).to have_gitlab_http_status(:ok)
+          expect(json_response).to be_an Hash
+          expect(json_response['status']).to eq('valid')
           expect(json_response['warnings']).to eq([])
-          expect(json_response['errors']).to eq(['Invalid configuration format'])
+          expect(json_response['errors']).to eq([])
         end
 
         it 'outputs expanded yaml content' do
-          post api('/ci/lint'), params: { content: yaml_content, include_merged_yaml: true }
+          post api('/ci/lint', api_user), params: { content: yaml_content, include_merged_yaml: true }
 
           expect(response).to have_gitlab_http_status(:ok)
           expect(json_response).to have_key('merged_yaml')
         end
       end
 
-      context 'with invalid configuration' do
-        let(:yaml_content) { '{ image: "ruby:2.7",  services: ["postgres"] }' }
+      context 'with valid .gitlab-ci.yaml with warnings' do
+        let(:yaml_content) { { job: { script: 'ls', rules: [{ when: 'always' }] } }.to_yaml }
 
-        it 'responds with errors about invalid configuration' do
-          post api('/ci/lint'), params: { content: yaml_content }
+        it 'passes validation but returns warnings' do
+          post api('/ci/lint', api_user), params: { content: yaml_content }
 
           expect(response).to have_gitlab_http_status(:ok)
-          expect(json_response['status']).to eq('invalid')
-          expect(json_response['warnings']).to eq([])
-          expect(json_response['errors']).to eq(['jobs config should contain at least one visible job'])
-        end
-
-        it 'outputs expanded yaml content' do
-          post api('/ci/lint'), params: { content: yaml_content, include_merged_yaml: true }
-
-          expect(response).to have_gitlab_http_status(:ok)
-          expect(json_response).to have_key('merged_yaml')
+          expect(json_response['status']).to eq('valid')
+          expect(json_response['warnings']).not_to be_empty
+          expect(json_response['status']).to eq('valid')
+          expect(json_response['errors']).to eq([])
         end
       end
-    end
 
-    context 'without the content parameter' do
-      it 'responds with validation error about missing content' do
-        post api('/ci/lint')
+      context 'with an invalid .gitlab_ci.yml' do
+        context 'with invalid syntax' do
+          let(:yaml_content) { 'invalid content' }
 
-        expect(response).to have_gitlab_http_status(:bad_request)
-        expect(json_response['error']).to eq('content is missing')
+          it 'responds with errors about invalid syntax' do
+            post api('/ci/lint', api_user), params: { content: yaml_content }
+
+            expect(response).to have_gitlab_http_status(:ok)
+            expect(json_response['status']).to eq('invalid')
+            expect(json_response['warnings']).to eq([])
+            expect(json_response['errors']).to eq(['Invalid configuration format'])
+          end
+
+          it 'outputs expanded yaml content' do
+            post api('/ci/lint', api_user), params: { content: yaml_content, include_merged_yaml: true }
+
+            expect(response).to have_gitlab_http_status(:ok)
+            expect(json_response).to have_key('merged_yaml')
+          end
+        end
+
+        context 'with invalid configuration' do
+          let(:yaml_content) { '{ image: "ruby:2.7",  services: ["postgres"] }' }
+
+          it 'responds with errors about invalid configuration' do
+            post api('/ci/lint', api_user), params: { content: yaml_content }
+
+            expect(response).to have_gitlab_http_status(:ok)
+            expect(json_response['status']).to eq('invalid')
+            expect(json_response['warnings']).to eq([])
+            expect(json_response['errors']).to eq(['jobs config should contain at least one visible job'])
+          end
+
+          it 'outputs expanded yaml content' do
+            post api('/ci/lint', api_user), params: { content: yaml_content, include_merged_yaml: true }
+
+            expect(response).to have_gitlab_http_status(:ok)
+            expect(json_response).to have_key('merged_yaml')
+          end
+        end
+      end
+
+      context 'without the content parameter' do
+        it 'responds with validation error about missing content' do
+          post api('/ci/lint', api_user)
+
+          expect(response).to have_gitlab_http_status(:bad_request)
+          expect(json_response['error']).to eq('content is missing')
+        end
       end
     end
   end
@@ -364,6 +409,18 @@ RSpec.describe API::Lint do
 
         expect(response).to have_gitlab_http_status(:not_found)
       end
+
+      context 'when project is public' do
+        before do
+          project.update!(visibility_level: Gitlab::VisibilityLevel::PUBLIC)
+        end
+
+        it 'returns authentication error' do
+          ci_lint
+
+          expect(response).to have_gitlab_http_status(:forbidden)
+        end
+      end
     end
 
     context 'when authenticated as non-member' do
@@ -387,13 +444,10 @@ RSpec.describe API::Lint do
         context 'when running as dry run' do
           let(:dry_run) { true }
 
-          it 'returns pipeline creation error' do
+          it 'returns authentication error' do
             ci_lint
 
-            expect(response).to have_gitlab_http_status(:ok)
-            expect(json_response['merged_yaml']).to eq(nil)
-            expect(json_response['valid']).to eq(false)
-            expect(json_response['errors']).to eq(['Insufficient permissions to create a new pipeline'])
+            expect(response).to have_gitlab_http_status(:forbidden)
           end
         end
 
@@ -410,7 +464,11 @@ RSpec.describe API::Lint do
             )
           end
 
-          it_behaves_like 'valid project config'
+          it 'returns authentication error' do
+            ci_lint
+
+            expect(response).to have_gitlab_http_status(:forbidden)
+          end
         end
       end
     end
diff --git a/spec/requests/api/merge_request_approvals_spec.rb b/spec/requests/api/merge_request_approvals_spec.rb
index fad5c3fb60..b18f3017e0 100644
--- a/spec/requests/api/merge_request_approvals_spec.rb
+++ b/spec/requests/api/merge_request_approvals_spec.rb
@@ -21,6 +21,12 @@ RSpec.describe API::MergeRequestApprovals do
 
       expect(response).to have_gitlab_http_status(:ok)
     end
+
+    context 'when merge request author has only guest access' do
+      it_behaves_like 'rejects user from accessing merge request info' do
+        let(:url) { "/projects/#{project.id}/merge_requests/#{merge_request.iid}/approvals" }
+      end
+    end
   end
 
   describe 'POST :id/merge_requests/:merge_request_iid/approve' do
diff --git a/spec/requests/api/merge_request_diffs_spec.rb b/spec/requests/api/merge_request_diffs_spec.rb
index 2e6cbe7bee..971fb5e991 100644
--- a/spec/requests/api/merge_request_diffs_spec.rb
+++ b/spec/requests/api/merge_request_diffs_spec.rb
@@ -35,6 +35,12 @@ RSpec.describe API::MergeRequestDiffs, 'MergeRequestDiffs' do
       get api("/projects/#{project.id}/merge_requests/0/versions", user)
       expect(response).to have_gitlab_http_status(:not_found)
     end
+
+    context 'when merge request author has only guest access' do
+      it_behaves_like 'rejects user from accessing merge request info' do
+        let(:url) { "/projects/#{project.id}/merge_requests/#{merge_request.iid}/versions" }
+      end
+    end
   end
 
   describe 'GET /projects/:id/merge_requests/:merge_request_iid/versions/:version_id' do
@@ -63,5 +69,11 @@ RSpec.describe API::MergeRequestDiffs, 'MergeRequestDiffs' do
       get api("/projects/#{project.id}/merge_requests/#{non_existing_record_iid}/versions/#{merge_request_diff.id}", user)
       expect(response).to have_gitlab_http_status(:not_found)
     end
+
+    context 'when merge request author has only guest access' do
+      it_behaves_like 'rejects user from accessing merge request info' do
+        let(:url) { "/projects/#{project.id}/merge_requests/#{merge_request.iid}/versions/#{merge_request_diff.id}" }
+      end
+    end
   end
 end
diff --git a/spec/requests/api/merge_requests_spec.rb b/spec/requests/api/merge_requests_spec.rb
index e7005bd3ec..b6c85e98bd 100644
--- a/spec/requests/api/merge_requests_spec.rb
+++ b/spec/requests/api/merge_requests_spec.rb
@@ -1087,6 +1087,12 @@ RSpec.describe API::MergeRequests do
       end
     end
 
+    context 'when merge request author has only guest access' do
+      it_behaves_like 'rejects user from accessing merge request info' do
+        let(:url) { "/projects/#{project.id}/merge_requests/#{merge_request.iid}" }
+      end
+    end
+
     context 'merge_request_metrics' do
       let(:pipeline) { create(:ci_empty_pipeline) }
 
@@ -1263,6 +1269,12 @@ RSpec.describe API::MergeRequests do
     it_behaves_like 'issuable participants endpoint' do
       let(:entity) { create(:merge_request, :simple, milestone: milestone1, author: user, assignees: [user], source_project: project, target_project: project, source_branch: 'markdown', title: "Test", created_at: base_time) }
     end
+
+    context 'when merge request author has only guest access' do
+      it_behaves_like 'rejects user from accessing merge request info' do
+        let(:url) { "/projects/#{project.id}/merge_requests/#{merge_request.iid}/participants" }
+      end
+    end
   end
 
   describe 'GET /projects/:id/merge_requests/:merge_request_iid/commits' do
@@ -1288,6 +1300,12 @@ RSpec.describe API::MergeRequests do
 
       expect(response).to have_gitlab_http_status(:not_found)
     end
+
+    context 'when merge request author has only guest access' do
+      it_behaves_like 'rejects user from accessing merge request info' do
+        let(:url) { "/projects/#{project.id}/merge_requests/#{merge_request.iid}/commits" }
+      end
+    end
   end
 
   describe 'GET /projects/:id/merge_requests/:merge_request_iid/:context_commits' do
@@ -1363,6 +1381,12 @@ RSpec.describe API::MergeRequests do
       expect(response).to have_gitlab_http_status(:not_found)
     end
 
+    context 'when merge request author has only guest access' do
+      it_behaves_like 'rejects user from accessing merge request info' do
+        let(:url) { "/projects/#{project.id}/merge_requests/#{merge_request.iid}/changes" }
+      end
+    end
+
     it_behaves_like 'find an existing merge request'
     it_behaves_like 'accesses diffs via raw_diffs'
 
@@ -1452,6 +1476,12 @@ RSpec.describe API::MergeRequests do
         expect(response).to have_gitlab_http_status(:forbidden)
       end
     end
+
+    context 'when merge request author has only guest access' do
+      it_behaves_like 'rejects user from accessing merge request info' do
+        let(:url) { "/projects/#{project.id}/merge_requests/#{merge_request.iid}/pipelines" }
+      end
+    end
   end
 
   describe 'POST /projects/:id/merge_requests/:merge_request_iid/pipelines' do
diff --git a/spec/requests/api/todos_spec.rb b/spec/requests/api/todos_spec.rb
index bc315c5b3c..4a86453a09 100644
--- a/spec/requests/api/todos_spec.rb
+++ b/spec/requests/api/todos_spec.rb
@@ -329,6 +329,14 @@ RSpec.describe API::Todos do
         expect(response).to have_gitlab_http_status(:not_found)
       end
     end
+
+    it 'returns an error if the issuable author does not have access' do
+      project_1.add_guest(issuable.author)
+
+      post api("/projects/#{project_1.id}/#{issuable_type}/#{issuable.iid}/todo", issuable.author)
+
+      expect(response).to have_gitlab_http_status(:not_found)
+    end
   end
 
   describe 'POST :id/issuable_type/:issueable_id/todo' do
diff --git a/spec/services/ci/abort_project_pipelines_service_spec.rb b/spec/services/ci/abort_project_pipelines_service_spec.rb
new file mode 100644
index 0000000000..9af909ac2a
--- /dev/null
+++ b/spec/services/ci/abort_project_pipelines_service_spec.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ci::AbortProjectPipelinesService do
+  let_it_be(:project) { create(:project) }
+  let_it_be(:pipeline) { create(:ci_pipeline, :running, project: project) }
+  let_it_be(:build) { create(:ci_build, :running, pipeline: pipeline) }
+
+  describe '#execute' do
+    it 'cancels all running pipelines and related jobs' do
+      result = described_class.new.execute(project)
+
+      expect(result).to be_success
+      expect(pipeline.reload).to be_canceled
+      expect(build.reload).to be_canceled
+    end
+
+    it 'avoids N+1 queries' do
+      control_count = ActiveRecord::QueryRecorder.new { described_class.new.execute(project) }.count
+
+      pipelines = create_list(:ci_pipeline, 5, :running, project: project)
+      create_list(:ci_build, 5, :running, pipeline: pipelines.first)
+
+      expect { described_class.new.execute(project) }.not_to exceed_query_limit(control_count)
+    end
+  end
+
+  context 'when feature disabled' do
+    before do
+      stub_feature_flags(abort_deleted_project_pipelines: false)
+    end
+
+    it 'does not abort the pipeline' do
+      result = described_class.new.execute(project)
+
+      expect(result).to be(nil)
+      expect(pipeline.reload).to be_running
+      expect(build.reload).to be_running
+    end
+  end
+end
diff --git a/spec/services/projects/destroy_service_spec.rb b/spec/services/projects/destroy_service_spec.rb
index f0f09218b0..75d1c98923 100644
--- a/spec/services/projects/destroy_service_spec.rb
+++ b/spec/services/projects/destroy_service_spec.rb
@@ -69,6 +69,12 @@ RSpec.describe Projects::DestroyService, :aggregate_failures do
       destroy_project(project, user, {})
     end
 
+    it 'performs cancel for project ci pipelines' do
+      expect(::Ci::AbortProjectPipelinesService).to receive_message_chain(:new, :execute).with(project)
+
+      destroy_project(project, user, {})
+    end
+
     context 'when project has remote mirrors' do
       let!(:project) do
         create(:project, :repository, namespace: user.namespace).tap do |project|
diff --git a/spec/support/shared_examples/requests/api/merge_requests_shared_examples.rb b/spec/support/shared_examples/requests/api/merge_requests_shared_examples.rb
new file mode 100644
index 0000000000..e6f9e5a434
--- /dev/null
+++ b/spec/support/shared_examples/requests/api/merge_requests_shared_examples.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+RSpec.shared_examples 'rejects user from accessing merge request info' do
+  let(:project) { create(:project, :private) }
+  let(:merge_request) do
+    create(:merge_request,
+      author: user,
+      source_project: project,
+      target_project: project
+    )
+  end
+
+  before do
+    project.add_guest(user)
+  end
+
+  it 'returns a 404 error' do
+    get api(url, user)
+
+    expect(response).to have_gitlab_http_status(:not_found)
+    expect(json_response['message']).to eq('404 Merge Request Not Found')
+  end
+end