HTML-escape search term in empty message

app/helpers/search_helper.rb

@@ -79,7 +79,7 @@ module SearchHelper
   def search_entries_empty_message(scope, term)
     (s_("SearchResults|We couldn't find any %{scope} matching %{term}") % {
       scope: search_entries_scope_label(scope, 0),
-      term: "<code>#{term}</code>"
+      term: "<code>#{h(term)}</code>"
     }).html_safe
   end
 

changelogs/unreleased/33668-fix-search-term-xss.yml

+---
+title: HTML-escape search term in empty message
+merge_request: 18319
+author:
+type: security

spec/helpers/search_helper_spec.rb

@@ -142,9 +142,9 @@ describe SearchHelper do
 
   describe 'search_entries_empty_message' do
     it 'returns the formatted entry message' do
-      message = search_entries_empty_message('projects', 'foo')
+      message = search_entries_empty_message('projects', '<h1>foo</h1>')
 
-      expect(message).to eq("We couldn't find any projects matching <code>foo</code>")
+      expect(message).to eq("We couldn't find any projects matching <code>&lt;h1&gt;foo&lt;/h1&gt;</code>")
       expect(message).to be_html_safe
     end
   end