CVE-2025-62508

Citizen is a MediaWiki skin that makes extensions part of the cohesive experience. Citizen from 3.3.0 to 3.9.0 are vulnerable to stored cross-site scripting in the sticky header button message handling. In stickyHeader.js the copyButtonAttributes function assigns innerHTML from a source element’s textContent when copying button labels. This causes escaped HTML in system message content (such as citizen-share, citizen-view-history, citizen-view-edit, and nstab-talk) to be interpreted as HTML in the sticky header, allowing injection of arbitrary script by a user with the ability to edit interface messages. The vulnerability allows a user with the editinterface right but without the editsitejs right (by default the sysop group has editinterface but may not have editsitejs) to execute arbitrary JavaScript in other users’ sessions, enabling unauthorized access to sensitive data or actions. The issue is fixed in 3.9.0.

• CWE-79

• https://github.com/StarCitizenTools/mediawiki-skins-Citizen/commit/e006923c6dbf113c9a025ca186ecc09fe7b93a15
• https://github.com/StarCitizenTools/mediawiki-skins-Citizen/commit/fbb1d4fe9627281567706f3f6fc99a42ce16fdc4
• https://github.com/StarCitizenTools/mediawiki-skins-Citizen/security/advisories/GHSA-g955-vw6w-v6pp

Published

Oct 17, 2025

Last Modified

Jun 17, 2026

Status

Deferred

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