CVE-2025-53479 – Mediawiki CheckUser Reflected Cross-Site Scripting

CVE ID : CVE-2025-53479

Published : July 8, 2025, 6:15 p.m. | 1 hour, 3 minutes ago

Description : The CheckUser extension’s Special:CheckUser interface is vulnerable to reflected XSS via the rev-deleted-user message. This message is rendered without proper escaping, making it possible to inject JavaScript through the uselang=x-xss language override mechanism.

This issue affects Mediawiki – CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.

Severity: 0.0 | NA

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