CVE-2025-53499: Wikimedia Foundation Mediawiki - Abusefilter Extension

Critical severity, CVSS 9.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Missing Authorization vulnerability in Wikimedia Foundation Mediawiki - AbuseFilter Extension allows Unauthorized Access.This issue affects Mediawiki - AbuseFilter Extension: from 1.43.X before 1.43.2.

Affected products

• Wikimedia Foundation Mediawiki - Abusefilter Extension: from 1.43, before 1.43.2 (fixed in 1.43.2)

Published 2025-07-07. Last modified 2026-06-17.