VULNERABILITY INTELLIGENCE

CVE-2025-53478

CVSS score5.4 MEDIUM

EPSS probability0.20%

CISA KEVNot currently listed

Published2025-07-07

Last modified2026-06-17

Description

The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to improper escaping of certain internationalized system messages rendered on the “IPs and User agents” tab. 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.