Medium severity5.4NVD Advisory· Published Jul 8, 2025· Updated Jun 17, 2026
CVE-2025-53480
CVE-2025-53480
Description
The CheckUser extension’s Special:Investigate page has a vulnerability in the Account information tab, where specific internationalized messages are rendered without proper escaping. Attackers can exploit this by appending ?uselang=x-xss to the URL, causing reflected XSS when the UI renders affected message keys.
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.
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Affected products
2- Range: >=1.39.0,<1.39.13, >=1.42.0,<1.42.7, >=1.43.0,<1.43.2
- Range: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2
Patches
Vulnerability mechanics
References
2News mentions
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