CVE-2025-53479

CVE-2025-53479: CheckUser: Reflected Cross-Site Scripting (XSS) in Special:CheckUser via unsanitized internationalized message

Vendor Wikimedia Foundation
Product Mediawiki - CheckUser extension
Weakness CWE-79 · XSS
Published July 8, 2025
Last update July 10, 2025
View on NVD All CVEs

CVSS base score

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What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 8, 2025 CVE published
July 10, 2025 Record updated