Debian Linux Security Advisory 2455-1 - Helmut Hummel of the typo3 security team discovered that typo3, a web content management system, is not properly sanitizing output of the exception handler. This allows an attacker to conduct cross-site scripting attacks if either third-party extensions are installed that do not sanitize this output on their own or in the presence of extensions using the extbase MVC framework which accept objects to controller actions.
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