All system messages in menu headings using the Menu.mustache template are inserted as raw HTML, allowing anybody who can edit those messages to insert arbitrary HTML into the DOM.
The system messages for menu headings are inserted unescaped into raw HTML: https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/072e4365e9084e4b153eac62d3666566c06f5a49/templates/Menu.mustache#L8-L10
uselang
parameter set to x-xss
On the main page of my test wiki, the following messages were shown: navigation
, notifications
, user-interface-preferences
, personaltools
, variants
, views
, associated-pages
, cactions
and toolbox
.
This impacts wikis where a group has the editinterface
but not the editsitejs
user right.
{ "github_reviewed": true, "nvd_published_at": "2025-06-12T19:15:20Z", "severity": "MODERATE", "cwe_ids": [ "CWE-79" ], "github_reviewed_at": "2025-06-13T14:08:31Z" }