🛡️ CVE-2025-62508 — citizen-skin

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-79 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Citizen vulnerable to stored XSS in sticky header button messages

Summary

The JS implementation for copying button labels to the sticky header in the Citizen skin unescapes HTML characters, allowing for stored XSS through system messages.

Details

In the copyButtonAttributes function in stickyHeader.js, when copying the button labels, the innerHTML of the new element is set to the textContent of the old element:

https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/f4cbcecf5aca0ae69966b23d4983f9cb5033f319/resources/skins.citizen.scripts/stickyHeader.js#L29-L41

This unescapes any escaped HTML characters and causes the contents of the system messages to be interpreted as HTML.

PoC

1. Edit any of the affected messages (citizen-share, citizen-view-history, citizen-view-edit, nstab-talk) to the following payload: <img src="" onerror="alert('Sticky Header Button XSS')">.

2. Visit any mainpage article in the wiki using the Citizen skin.

<img width="495" height="228" alt="image" src="https://github.com/user-attachments/assets/ac75b8e1-b181-4335-9526-17d6b6f8518e" />

<img width="569" height="157" alt="image" src="https://github.com/user-attachments/assets/c052edb9-ff68-4869-9c66-3ec85e7ff68a" />

Impact

This impacts wikis where a group has the editinterface but not the editsitejs user right. By default, this is the case for the sysop group.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability none.

Weakness class

CVE-2025-62508 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2025-62508 is recorded against 2 packages.

  • starcitizentools/citizen-skin (from 3.3.0 up to 3.9.0)
  • unknown

Timeline and source

Published on 20 October 2025. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)

Details

Severity Medium
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2025-10-20
Updated 2026-08-12
Modified 2025-10-20
Fix URL N/A

Affected Packages

Software From version Fixed in
starcitizentools/citizen-skin 3.3.0 3.9.0
unknown — —

Similar Threats

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