Citizen vulnerable to Stored XSS through short descriptions

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.6 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

EPSS

• CVE-2025-53370: 0.38% estimated exploitation activity in the next 30 days; percentile 31.75 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Short descriptions set via the ShortDescription extension are inserted as raw HTML by the Citizen skin, allowing any user to insert arbitrary HTML into the DOM by editing a page. Details The shortdesc property, which contains unsanitized user input, is retrieved from the OutputPage and returned as the tagline: https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/0d8a44011e02a081618359a1e90f462478e807aa/includes/Components/CitizenComponentPageHeading.php#L249-L251 The tagline is then provided to the template data: https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/0d8a44011e02a081618359a1e90f462478e807aa/includes/Components/CitizenComponentPageHeading.php#L270-L275 The template then inserts the tagline into raw HTML without doing any escaping: https://github.com/StarCitizenTools/mediawiki-skins-Citizen/blob/0d8a44011e02a081618359a1e90f462478e807aa/templates/PageHeading.mustache#L12 PoC 1. Enable Citizen and ShortDescription 2. Add {{SHORTDESC:<img…

Published by the source

3 Jul 2025, 21:29 UTC

Last modified by the source

3 Jul 2025, 21:53 UTC

Source last checked

26 Oct 2026, 14:34 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-prmv-7r8c-794g

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# Patch Next advisory brief: CVE-2025-53370

Advisory: Citizen vulnerable to Stored XSS through short descriptions
IDs: CVE-2025-53370, GHSA-prmv-7r8c-794g
Record: https://patchnext.com/advisories/cve-2025-53370 (revision 1, source checked 26 Oct 2026, 14:34 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: starcitizentools/citizen-skin 3.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist starcitizentools/citizen-skin: affected >= 1.9.4, < 3.4.0; fixed in 3.4.0

## Suggested inspection (read-only)
- Packagist starcitizentools/citizen-skin: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on starcitizentools/citizen-skin.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-prmv-7r8c-794g (GitHub-reviewed advisory GHSA-prmv-7r8c-794g lists affected ranges: Packagist starcitizentools/citizen-skin >=1.9.4 <3.4.0)

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