The (old) Form Content Element component in TYPO3 4.5.0 through 4.5.31, 4.7.0 through 4.7.16, 6.0.0 through 6.0.11, and 6.1.0 through 6.1.6 allows remote authenticated editors to generate arbitrary HMAC signatures and bypass intended access restrictions via unspecified vectors.
http://www.debian.org/security/2014/dsa-2834
http://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2013-004/