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CVE-2025-53478

Published: Jul 7, 2025

Modified: Jul 7, 2025

PUBLISHED

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.

Vendor	Product	Versions
Wikimedia Foundation	Mediawiki - CheckUser extension	affected `1.39.x - < 1.39.13` affected `1.42.x - < 1.42.7` affected `1.43.x - < 1.43.2`

Weaknesses (CWE)

References

https://phabricator.wikimedia.org/T394692

https://gerrit.wikimedia.org/r/q/I3a1e21b6800ff4d813a33ee9fe9b7ccf070b6b2e

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