From the Debian advisory: Several remote vulnerabilities have been
discovered in the TYPO3 content management framework.
Because of a not sufficiently secure default value of the TYPO3
configuration variable fileDenyPattern, authenticated backend users
could upload files that allowed to execute arbitrary code as the
webserver user.
User input processed by fe_adminlib.inc is not being properly filtered
to prevent Cross Site Scripting (XSS) attacks, which is exposed when
specific plugins are in use.
