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.
References to Advisories, Solutions, and Tools
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[MediaWiki-announce] 20130903 MediaWiki Security Release: 1.21.2, 1.20.7 and 1.19.8
[oss-security] 20130904 Re: CVE request: MediaWiki Security Release: 1.21.2, 1.20.7 and 1.19.8