CVE-2013-4304: Brion Vibber Centralauth Extension

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

The CentralAuth extension for MediaWiki 1.19.x before 1.19.8, 1.20.x before 1.20.7, and 1.21.x before 1.21.2 caches a valid CentralAuthUser object in the centralauth_User cookie even when a user has not successfully logged in, which allows remote attackers to bypass authentication without a password.

Affected products

• Brion Vibber Centralauth Extension: affected versions not specified
• Mediawiki Mediawiki: version 1.19 only; version 1.19.0 only; version 1.19.1 only; version 1.19.2 only; version 1.19.3 only; version 1.19.4 only; …

Published 2014-01-26. Last modified 2026-06-16.