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starcitizentools/mediawiki-skins-citizen · Security

starcitizentools/citizen-skin allows stored XSS in menu heading message

GHSA ID
GHSA-g3cp-pq72-hjpv
CVE ID
CVE-2025-49579
Severity
medium
Published
Updated
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
CVSS v3
6.5 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

Description

Summary

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.

Details

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

PoC

  1. Go to any article using citizen with the uselang parameter set to x-xss
  2. A large number of alerts will be shown for various messages, e.g.: image image

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.

Impact

This impacts wikis where a group has the editinterface but not the editsitejs user right.

CWEs

  • CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

Open GitHub