CVE-2021-31554: Mediawiki

Medium severity, CVSS 5.4. EPSS: 0.5% chance of exploitation in the next 30 days.

An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. It improperly handled account blocks for certain automatically created MediaWiki user accounts, thus allowing nefarious users to remain unblocked.

Affected products

• Mediawiki Mediawiki: up to and including 1.35.2

Published 2021-04-22. Last modified 2026-06-17.