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CVE

CWE

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CVE-2025-53479

Published: Jul 8, 2025

Modified: Jul 10, 2025

PUBLISHED

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.

Vendor	Product	Versions
Wikimedia Foundation	Mediawiki - CheckUser extension	affected `1.42.x - < 1.42.7` affected `1.43.x - < 1.43.2`

Weaknesses (CWE)

References

https://phabricator.wikimedia.org/T394693

https://gerrit.wikimedia.org/r/q/I159e14543912cb3bc7f4a00c3090c0285b154786

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