The Install Tool subcomponent in TYPO3 4.0.13 and earlier, 4.1.x before 4.1.13, 4.2.x before 4.2.10, and 4.3.x before 4.3beta2 allows remote attackers to gain access by using only the password's md5 hash as a credential.
https://exchange.xforce.ibmcloud.com/vulnerabilities/53928
http://www.vupen.com/english/advisories/2009/3009
http://www.securityfocus.com/bid/36801
http://typo3.org/teams/security/security-bulletins/typo3-sa-2009-016/