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CVE PROGRAM SOURCE RECORD5.4 Medium

CVE-2025-53479

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

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Status
Published
Published
Updated
Assigning organization
wikimedia-foundation

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Wikimedia Foundation Mediawiki - CheckUser extension

Default version status: unaffected

  • 1.42.x to < 1.42.7affected
  • 1.43.x to < 1.43.2affected

References