Citizen vulnerable to Stored XSS through short descriptions

中 5.4CVE-2025-53370 · GHSA-prmv-7r8c-794g · 03/07/2025 公開 · 17/06/2026 更新

要点

CVE-2025-53370 は starcitizentools/citizen-skin, citizen (starcitizen.tools) に影響する深刻度「中」 (CVSS 5.4) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.38%（全脆弱性の 31.9% より高い）。
対処：3.4.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
starcitizentools/citizen-skin Packagist	`≥ 1.9.4, < 3.4.0`	`3.4.0`
citizen starcitizen.tools	`≥ 1.9.4, < 3.4.0`	`3.4.0`

概要

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

Enable Citizen and ShortDescription
Add {{SHORTDESC:<img src="" onerror="alert('citizen shortdescription xss')">}} to a page
Visit the page

Impact

Arbitrary HTML can be inserted into the DOM by any user, allowing for JavaScript to be executed.

NVD の説明

Citizen is a MediaWiki skin that makes extensions part of the cohesive experience. From versions 1.9.4 to before 3.4.0, 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. This issue has been patched in version 3.4.0.