CVE-2025-53370

HIGH8.6EPSS 0.17%

Citizen vulnerable to Stored XSS through short descriptions

Published: 7/3/2025Modified: 7/3/2025
Also known as:GHSA-prmv-7r8c-794g

Description

### 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:<img src="" onerror="alert('citizen shortdescription xss')">}}` to a page 3. Visit the page ![image](https://github.com/user-attachments/assets/d45f3626-c5eb-4477-86af-d15d3a1edb96) ![image](https://github.com/user-attachments/assets/84a8c447-d441-4bd6-b6d6-48e504527c4e) ### Impact Arbitrary HTML can be inserted into the DOM by any user, allowing for JavaScript to be executed.

Affected packages (1)

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1HIGH8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

References (6)