The configuration module in the backend in TYPO3 4.5.x before 4.5.19, 4.6.x before 4.6.12 and 4.7.x before 4.7.4 allows remote authenticated backend users to obtain the encryption key via unspecified vectors.
https://github.com/advisories/GHSA-7gg8-3r6j-5g55
https://exchange.xforce.ibmcloud.com/vulnerabilities/77793
http://www.openwall.com/lists/oss-security/2012/08/22/8
http://www.debian.org/security/2012/dsa-2537
http://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2012-004/