{"id":59016,"date":"2025-07-10T22:30:24","date_gmt":"2025-07-10T22:30:24","guid":{"rendered":""},"modified":"2025-10-24T11:55:22","modified_gmt":"2025-10-24T17:55:22","slug":"cve-2025-53370-arbitrary-html-insertion-vulnerability-in-citizen-mediawiki-skin","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-53370-arbitrary-html-insertion-vulnerability-in-citizen-mediawiki-skin\/","title":{"rendered":"CVE-2025-53370: Arbitrary HTML Insertion Vulnerability in Citizen MediaWiki Skin<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The Citizen MediaWiki skin, an extension that enhances the visual experience of MediaWiki users, has recently been identified with a significant vulnerability. This security flaw, designated CVE-2025-53370, exposes systems to potential compromise and data leakage. The vulnerability affects versions<\/a> 1.9.4 to 3.4.0 of the Citizen skin, and is a matter of grave concern for any organization or individual using this particular skin for their MediaWiki sites. The vulnerability has serious<\/a> implications, making it a high priority issue that should be addressed immediately by all users.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-53370
\nSeverity: High (8.6)
\nAttack Vector: Web-based
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: System compromise and potential<\/a> data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Citizen MediaWiki<\/a> Skin | 1.9.4 to 3.4.0<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit takes advantage of a flaw in the Citizen MediaWiki skin. The skin, when used with the ShortDescription extension, inserts short descriptions<\/a> as raw HTML. This allows any user<\/a> to insert arbitrary HTML into the Document Object Model (DOM) of a page by simply editing it. This could allow an attacker to inject malicious scripts, which could lead to system compromise or data leakage<\/a>.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here is a conceptual example of how the vulnerability might be exploited:<\/p>\n

\n\n\nSHORT_DESCRIPTION = \"<script>malicious_code();<\/script>\"<\/code><\/pre>\n
The malicious code could perform a variety of harmful actions, such as stealing sensitive data<\/a> or taking control of the user’s session.<\/p>\n
Mitigation<\/strong><\/p>\n
A patch for this vulnerability has been released in version 3.4.0 of the Citizen MediaWiki<\/a> Skin. All users are strongly urged to apply this patch immediately. If immediate patching is not possible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer temporary mitigation by detecting and blocking attempts to exploit this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The Citizen MediaWiki skin, an extension that enhances the visual experience of MediaWiki users, has recently been identified with a significant vulnerability. This security flaw, designated CVE-2025-53370, exposes systems to potential compromise and data leakage. The vulnerability affects versions 1.9.4 to 3.4.0 of the Citizen skin, and is a matter of grave concern for […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-59016","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t