Correctly escape wiki commit message characters

https://gitlab.com/gitlab-org/gitlab/issues/35478

app/assets/javascripts/pages/projects/wikis/wikis.js

@@ -40,7 +40,7 @@ export default class Wikis {
     // Replace hyphens with spaces
     if (title) title = title.replace(/-+/g, ' ');
 
-    const newCommitMessage = sprintf(this.commitMessageI18n, { pageTitle: title });
+    const newCommitMessage = sprintf(this.commitMessageI18n, { pageTitle: title }, false);
     this.commitMessageInput.value = newCommitMessage;
   }
 

changelogs/unreleased/21371-auto-generated-wiki-commit-message-having-html-encoded-entities.yml

+---
+title: Auto generated wiki commit message containing HTML encoded entities
+merge_request: 21371
+author: 2knal
+type: other

spec/features/projects/wiki/user_updates_wiki_page_spec.rb

@@ -83,15 +83,15 @@ describe 'User updates wiki page' do
       end
 
       it 'updates the commit message as the title is changed', :js do
-        fill_in(:wiki_title, with: 'Wiki title')
+        fill_in(:wiki_title, with: '& < > \ \ { } &')
 
-        expect(page).to have_field('wiki[message]', with: 'Update Wiki title')
+        expect(page).to have_field('wiki[message]', with: 'Update & < > \ \ { } &')
       end
 
-      it 'does not allow XSS', :js do
-        fill_in(:wiki_title, with: '<script>')
+      it 'correctly escapes the commit message entities', :js do
+        fill_in(:wiki_title, with: 'Wiki title')
 
-        expect(page).to have_field('wiki[message]', with: 'Update &lt;script&gt;')
+        expect(page).to have_field('wiki[message]', with: 'Update Wiki title')
       end
 
       it 'shows a validation error message' do

spec/features/projects/wiki/user_views_wiki_page_spec.rb

@@ -129,6 +129,18 @@ describe 'User views a wiki page' do
     end
   end
 
+  context 'when a page has XSS in its message' do
+    before do
+      wiki_page.update(message: '<script>alert(true)<script>', content: 'XSS update')
+    end
+
+    it 'safely displays the message' do
+      visit(project_wiki_history_path(project, wiki_page))
+
+      expect(page).to have_content('<script>alert(true)<script>')
+    end
+  end
+
   context 'when page has invalid content encoding' do
     let(:content) { (+'whatever').force_encoding('ISO-8859-1') }