CVE-2013-4304: Improper Authentication

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 centralauthUser cookie even when a user has not successfully logged in, which allows remote attackers to bypass authentication without a passwo...