CVE-2026-39937: The Wikimedia Foundation Mediawiki - Centralauth Extension

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper removal of sensitive information before storage or transfer vulnerability in The Wikimedia Foundation Mediawiki - CentralAuth Extension allows Resource Leak Exposure. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

Affected products

• The Wikimedia Foundation Mediawiki - Centralauth Extension: before 1.43 (fixed in 1.43)

Published 2026-04-07. Last modified 2026-07-21.