Unspecified vulnerability in the OpenID Identity Authentication extension in TYPO3 4.3.0 allows remote attackers to bypass authentication and gain access to a backend user account via unknown attack vectors in which both the attacker and victim have an OpenID provider that discards identities during authentication.
https://exchange.xforce.ibmcloud.com/vulnerabilities/55609
http://www.vupen.com/english/advisories/2010/0127
http://typo3.org/teams/security/security-bulletins/typo3-sa-2010-001/