VULNERABILITY INTELLIGENCE
CVE-2025-53479
CVSS score5.4 MEDIUM
EPSS probability0.20%
CISA KEVNot currently listed
Published2025-07-08
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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 1.42.X before 1.42.7, from 1.43.X before 1.43.2.
Weakness classification
- c4f26cc8-17ff-4c99-b5e2-38fc1793eacc: CWE-79