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CVE-2025-53369: MediaWiki Short Description Extension Vulnerability

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Overview

In the ever-evolving landscape of cybersecurity threats, understanding vulnerabilities and how they impact our systems is crucial. One such vulnerability, identified as CVE-2025-53369, affects the MediaWiki short description extension. This vulnerability has the potential to cause significant damage, including system compromise and data leakage, as it allows any user to insert arbitrary HTML into the Document Object Model (DOM). This vulnerability matters because it can lead to unauthorized access, alteration of data and potentially compromising the whole system.

Vulnerability Summary

CVE ID: CVE-2025-53369
Severity: High – 8.6 (CVSS Severity Score)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: System Compromise, Data Leakage

Affected Products

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Product | Affected Versions

MediaWiki | 4.0.0

How the Exploit Works

This vulnerability lies in the MediaWiki extension that provides short description support. It does not properly sanitize short descriptions before they are inserted as HTML using mw.util.addSubtitle. As a result, any user with the ability to edit a page can insert arbitrary HTML into the DOM. This arbitrary HTML code could be malicious, and could potentially compromise the system or lead to data leakage.

Conceptual Example Code

An exploit might look like this:

POST /edit/page HTTP/1.1
Host: wiki.example.com
Content-Type: text/html
{ "page_content": "<script>/*Malicious JavaScript Code*/</script>" }

In this example, the attacker is editing the page content with a POST request. They insert malicious JavaScript code, which will be executed when the page is loaded.

Mitigation

The vendor has released a patch for this vulnerability in version 4.0.1 of the MediaWiki extension. Users of affected versions are advised to update to the patched version immediately. Alternatively, as a temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could be used to block or alert on attempts to exploit this vulnerability. However, these are stopgap measures and updating the software should not be delayed.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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