CVE-2025-49577: Citizen allows stored XSS in preference menu headings

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-06-12 · updated 2026-06-17
Weakness: CWE-79

Description

Citizen is a MediaWiki skin that makes extensions part of the cohesive experience. Various preferences messages are inserted into raw HTML, allowing anybody who can edit those messages to insert arbitrary HTML into the DOM. This vulnerability is fixed in 3.3.1.

Affected products

StarCitizenTools mediawiki-skins-Citizen: before 3.3.1 — fixed in 3.3.1

How to fix

Upgrade to a fixed version: StarCitizenTools mediawiki-skins-Citizen 3.3.1. Check the vendor advisory for mitigations.

References

https://github.com/StarCitizenTools/mediawiki-skins-Citizen/commit/93c36ac778397e0e7c46cf7adb1e5d848265f1bd
https://github.com/StarCitizenTools/mediawiki-skins-Citizen/commit/a741639085d70c22a9f49890542a142a223bf981
https://github.com/StarCitizenTools/mediawiki-skins-Citizen/security/advisories/GHSA-jwr7-992g-68mh

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