CVE-2025-53370 – starcitizentools/citizen-skin

Package

Manager: composer
Name: starcitizentools/citizen-skin
Vulnerable Version: >=1.9.4 <3.4.0

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N

EPSS: 0.00037 pctl0.09927

Details

Citizen vulnerable to Stored XSS through short descriptions ### Summary Short descriptions set via the [ShortDescription extension](https://www.mediawiki.org/wiki/Extension:ShortDescription) 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:&lt;img src="" onerror="alert('citizen shortdescription xss')"&gt;}}` to a page 3. Visit the page   ### Impact Arbitrary HTML can be inserted into the DOM by any user, allowing for JavaScript to be executed.

Metadata

Created: 2025-07-03T21:29:16Z
Modified: 2025-07-03T21:53:07Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/07/GHSA-prmv-7r8c-794g/GHSA-prmv-7r8c-794g.json
CWE IDs: ["CWE-79"]
Alternative ID: GHSA-prmv-7r8c-794g
Finding: F425
Auto approve: 1