CVE-2025-61647: Wikimedia Foundation Checkuser

Low severity, CVSS 0.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files src/Api/Rest/Handler/UserInfoHandler.Php. This issue affects CheckUser: from a3dc1bbcc33acbcca6831d6afaccbb1054c93a57, 0584eb2ad564648aa3ce9c555dd044dda02b55f4.

Affected products

• Wikimedia Foundation Checkuser

Published 2026-02-03. Last modified 2026-06-17.