The Backend 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 authenticated users to place arbitrary web sites in TYPO3 backend framesets via crafted parameters, related to a "frame hijacking" issue.
https://exchange.xforce.ibmcloud.com/vulnerabilities/53920
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/