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Vulnerability · Published Oct 17, 2025 · Assigned by GitHub_M

CVE-2025-62508Citizen vulnerable to stored XSS in sticky header button messages

Medium 6.5

In plain English

A medium-severity cross-site scripting in mediawiki-skins-Citizen from StarCitizenTools. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 60.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagiststarcitizentools/citizen-skin3.9.0GHSA-g955-vw6w-v6pp

Affected products (as reported)

VendorProductVersions
StarCitizenTools mediawiki-skins-Citizen >= 3.3.0, < 3.9.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

References