Executive Summary

CVE-2025-62671 is a stored Cross-Site Scripting (XSS) vulnerability in the MediaWiki Cargo extension. It occurs because malicious HTML inserted into Cargo table fields is rendered without proper sanitization. Specifically, the filter value used in Cargo drilldown pages is not escaped before being output as HTML, allowing attackers to inject and store executable scripts that run when the page is viewed. [1]

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Impact Analysis

This vulnerability can allow attackers to execute arbitrary scripts in the context of users viewing the affected MediaWiki pages. This can lead to theft of user credentials, session hijacking, defacement, or other malicious actions performed on behalf of the user without their consent. [1]

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Detection Guidance

This vulnerability can be detected by checking for the presence of unsanitized HTML or script tags in Cargo table fields rendered in the drilldown pages of the MediaWiki Cargo extension. One practical approach is to create a test page with a payload containing a script tag (e.g., <script>alert('xss')</script>) in a Cargo table field and then visit the drilldown page to see if the script executes. There are no specific network commands provided, but manual testing via the MediaWiki interface as described can reveal the vulnerability. [1]

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Mitigation Strategies

Immediate mitigation steps include applying the patch that escapes filter values before outputting them as HTML in the Cargo extension, specifically the fix merged as Change #1179707. Until the patch is applied, avoid allowing untrusted users to input data into Cargo table fields that are rendered in drilldown pages, or disable the drilldown feature if possible. Updating the Cargo extension to the fixed version is the recommended action. [1]

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