diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index e8ae7b8db19..2c4cb55844c 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -616,13 +616,16 @@ class ProjectsController < Projects::ApplicationController
   def redirect_git_extension
     return unless params[:format] == 'git'
 
+    git_extension_regex = %r{\.git/?\Z}
+    return unless request.path.match?(git_extension_regex)
+
     # `project` calls `find_routable!`, so this will trigger the usual not-found
     # behaviour when the user isn't authorized to see the project
     return if project.nil? || performed?
 
     uri = URI(request.original_url)
     # Strip the '.git' part from the path
-    uri.path = uri.path.sub(%r{\.git/?\Z}, '')
+    uri.path = uri.path.sub(git_extension_regex, '')
 
     redirect_to(uri.to_s)
   end
diff --git a/app/models/board.rb b/app/models/board.rb
index e407ffe582f..d98b43164fb 100644
--- a/app/models/board.rb
+++ b/app/models/board.rb
@@ -11,7 +11,7 @@ class Board < ApplicationRecord
   has_many :lists, -> { ordered }, dependent: :delete_all, inverse_of: :board # rubocop:disable Cop/ActiveRecordDependent
   has_many :destroyable_lists, -> { destroyable.ordered }, class_name: "List", inverse_of: :board
 
-  validates :name, presence: true
+  validates :name, presence: true, length: { maximum: 255, if: :name_changed? }
   validates :project, presence: true, if: :project_needed?
   validates :group, presence: true, unless: :project
   validates :group, absence: {
diff --git a/app/models/concerns/web_hooks/hook.rb b/app/models/concerns/web_hooks/hook.rb
index fae6efbd756..0a8df4c662c 100644
--- a/app/models/concerns/web_hooks/hook.rb
+++ b/app/models/concerns/web_hooks/hook.rb
@@ -7,6 +7,7 @@ module WebHooks
     InterpolationError = Class.new(StandardError)
 
     SECRET_MASK = '************'
+    MAX_PARAM_LENGTH = 8192
 
     # See app/validators/json_schemas/web_hooks_url_variables.json
     VARIABLE_REFERENCE_RE = /\{([A-Za-z]+[0-9]*(?:[._-][A-Za-z0-9]+)*)\}/
@@ -45,9 +46,14 @@ module WebHooks
         encode_iv: false
 
       validates :url, presence: true
-      validates :url, public_url: true, if: ->(hook) { hook.validate_public_url? && !hook.url_variables? }
+      validates :url, length: { maximum: MAX_PARAM_LENGTH }
+      validates :url, public_url: true, if: ->(hook) {
+        # Apply the validation up to the point where the length validation above would make the record invalid.
+        # See https://gitlab.com/gitlab-org/gitlab/-/issues/524020#note_2529307579
+        (hook.url&.length&.<= MAX_PARAM_LENGTH) && hook.validate_public_url? && !hook.url_variables?
+      }
 
-      validates :token, format: { without: /\n/ }
+      validates :token, length: { maximum: MAX_PARAM_LENGTH }, format: { without: /\n/ }
 
       after_initialize :initialize_url_variables
       after_initialize :initialize_custom_headers
diff --git a/lib/gitlab/git_access.rb b/lib/gitlab/git_access.rb
index e37d71e51c3..977deb56ccf 100644
--- a/lib/gitlab/git_access.rb
+++ b/lib/gitlab/git_access.rb
@@ -83,8 +83,7 @@ module Gitlab
       check_command_disabled!
       check_command_existence!
 
-      custom_action = check_custom_action
-      return custom_action if custom_action
+      check_custom_ssh_action!
 
       check_db_accessibility!
       check_container!
@@ -185,7 +184,7 @@ module Gitlab
       check_project_accessibility!
     end
 
-    def check_custom_action
+    def check_custom_ssh_action!
       # no-op: Overridden in EE
     end
 
diff --git a/lib/gitlab/git_access_snippet.rb b/lib/gitlab/git_access_snippet.rb
index 8c291dd56ba..9eda2099eb7 100644
--- a/lib/gitlab/git_access_snippet.rb
+++ b/lib/gitlab/git_access_snippet.rb
@@ -46,8 +46,8 @@ module Gitlab
     private
 
     # TODO: Implement EE/Geo https://gitlab.com/gitlab-org/gitlab/issues/205629
-    override :check_custom_action
-    def check_custom_action
+    override :check_custom_ssh_action!
+    def check_custom_ssh_action!
       # snippets never return custom actions, such as geo replication.
     end
 
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index e05a8518509..92a853527ff 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -47221,6 +47221,9 @@ msgstr ""
 msgid "Project %{code_open}%{source_project}%{code_close} has more restricted access settings than %{code_open}%{target_project}%{code_close}. To avoid exposing private changes, make sure you're submitting changes to the correct project."
 msgstr ""
 
+msgid "Project %{project_name} and framework are not from same namespace."
+msgstr ""
+
 msgid "Project %{project_repo} could not be found"
 msgstr ""
 
@@ -47413,6 +47416,9 @@ msgstr ""
 msgid "Project was not found or you do not have permission to add this project to Security Dashboards."
 msgstr ""
 
+msgid "Project with ID %{project_id} not found"
+msgstr ""
+
 msgid "Project:Branches: %{source_project_path}:%{source_branch} to %{target_project_path}:%{target_branch}"
 msgstr ""
 
diff --git a/spec/controllers/projects_controller_spec.rb b/spec/controllers/projects_controller_spec.rb
index ceb09bbaa9f..e9f98453feb 100644
--- a/spec/controllers/projects_controller_spec.rb
+++ b/spec/controllers/projects_controller_spec.rb
@@ -459,6 +459,39 @@ RSpec.describe ProjectsController, feature_category: :groups_and_projects do
       end
     end
 
+    context 'redirection from http://someproject?format=git' do
+      let_it_be_with_reload(:public_project) { create(:project, :public) }
+
+      context 'with git in project path' do
+        before do
+          public_project.update!(path: 'my.gitlab')
+
+          request.env['PATH_INFO'] = "/#{public_project.namespace.path}/#{public_project.path}"
+          request.env['QUERY_STRING'] = 'format=git'
+        end
+
+        it 'does not trigger a redirect' do
+          get :show,
+            params: { namespace_id: public_project.namespace.path, id: public_project.path },
+            format: :git
+
+          expect(response).to have_gitlab_http_status(:not_found)
+          expect(response).not_to redirect_to(project_path(public_project))
+        end
+      end
+
+      context 'with git not in project path' do
+        it 'does trigger a redirect' do
+          get :show,
+            params: { namespace_id: public_project.namespace.path, id: public_project.path },
+            format: :git
+
+          expect(response).to have_gitlab_http_status(:found)
+          expect(response).to redirect_to(project_path(public_project))
+        end
+      end
+    end
+
     context 'when project is moved and git format is requested' do
       let(:old_path) { project.path + 'old' }
 
diff --git a/spec/models/board_spec.rb b/spec/models/board_spec.rb
index ddf1170d908..c9eb372bf4b 100644
--- a/spec/models/board_spec.rb
+++ b/spec/models/board_spec.rb
@@ -18,9 +18,22 @@ RSpec.describe Board do
   end
 
   describe 'validations' do
+    let_it_be(:board) { build(:board, project: project) }
+
     it { is_expected.to validate_presence_of(:name) }
     it { is_expected.to validate_presence_of(:project) }
 
+    it 'validates name length is at most 255 characters when name is changed' do
+      board.name = 'a' * 256
+      expect(board).not_to be_valid
+      expect(board.errors[:name]).to include('is too long (maximum is 255 characters)')
+    end
+
+    it 'allows names up to 255 characters' do
+      board.name = 'a' * 255
+      expect(board).to be_valid
+    end
+
     describe 'group and project mutually exclusive' do
       context 'when project is present' do
         subject { described_class.new(project: project) }
diff --git a/spec/support/shared_examples/models/concerns/web_hooks/web_hook_shared_examples.rb b/spec/support/shared_examples/models/concerns/web_hooks/web_hook_shared_examples.rb
index 80bc6703e2a..bbb68f36a8f 100644
--- a/spec/support/shared_examples/models/concerns/web_hooks/web_hook_shared_examples.rb
+++ b/spec/support/shared_examples/models/concerns/web_hooks/web_hook_shared_examples.rb
@@ -20,6 +20,8 @@ RSpec.shared_examples 'a webhook' do |factory:|
     it { is_expected.to validate_length_of(:custom_webhook_template).is_at_most(4096) }
     it { is_expected.to validate_length_of(:name).is_at_most(255) }
     it { is_expected.to validate_length_of(:description).is_at_most(2048) }
+    it { is_expected.to validate_length_of(:url).is_at_most(described_class::MAX_PARAM_LENGTH) }
+    it { is_expected.to validate_length_of(:token).is_at_most(described_class::MAX_PARAM_LENGTH) }
 
     describe 'url_variables' do
       it { is_expected.to allow_value({}).for(:url_variables) }
@@ -110,6 +112,33 @@ RSpec.shared_examples 'a webhook' do |factory:|
         end
       end
 
+      context 'when testing PublicUrlValidator execution around MAX_PARAM_LENGTH threshold' do
+        # Ensures invalid URLs are rejected at all lengths around MAX_PARAM_LENGTH boundary.
+        # PublicUrlValidator runs only when length <= MAX_PARAM_LENGTH, so we verify
+        # the webhook stays invalid whether rejected by URL format or by length.
+
+        let(:invalid_url_base) { 'ftp://example.com/' }
+        let(:padding_to_max_length) { described_class::MAX_PARAM_LENGTH - invalid_url_base.length }
+
+        context 'with URL length 1 less than MAX_PARAM_LENGTH' do
+          let(:url) { invalid_url_base + ('x' * (padding_to_max_length - 1)) }
+
+          it { is_expected.not_to allow_value(url).for(:url).with_message(including('allowed schemes are http')) }
+        end
+
+        context 'with URL length exactly MAX_PARAM_LENGTH' do
+          let(:url) { invalid_url_base + ('x' * padding_to_max_length) }
+
+          it { is_expected.not_to allow_value(url).for(:url).with_message(including('allowed schemes are http')) }
+        end
+
+        context 'with URL length 1 more than MAX_PARAM_LENGTH' do
+          let(:url) { invalid_url_base + ('x' * (padding_to_max_length + 1)) }
+
+          it { is_expected.not_to allow_value(url).for(:url).with_message(including('is too long')) }
+        end
+      end
+
       it 'strips :url before saving it' do
         hook.url = ' https://example.com '
         hook.save!