CVE-2019-16529: Mediawiki Checkuser

Medium severity, CVSS 5.3. EPSS: 0.9% chance of exploitation in the next 30 days.

An issue was discovered in the CheckUser extension through 1.35.0 for MediaWiki. Oversighted edit summaries are still visible in CheckUser results in violation of MediaWiki's permissions model.

Affected products

• Mediawiki Checkuser: up to and including 1.35

Published 2020-03-19. Last modified 2026-06-17.