CVE-2020-10534: Mediawiki

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

In the GlobalBlocking extension before 2020-03-10 for MediaWiki through 1.34.0, an issue related to IP range evaluation resulted in blocked users re-gaining escalated privileges. This is related to the case in which an IP address is contained in two ranges, one of which is locally disabled.

Affected products

• Mediawiki Mediawiki: up to and including 1.34.0

Published 2020-03-12. Last modified 2026-06-17.