The Horde project relies on code similar to Popoon's externalinput.php to filter out potential cross site scripting attacks on user-supplied input. Other projects are using the same code base. Therefore this vulnerability affects also the popular Cake-PHP framework. Hence, all users that rely on the externalinput sanitization functionality are affected by this vulnerability, as in addition to many other unrelated, open source projects.
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Two cross-site scripting (XSS) vulnerabilities were reported in Horde Framework. The first of which is that the Horde framework fails to properly sanitize the filename of MIME attachments on received emails. The second vulnerability has a wider impact. Horde relies on code similar to Popoon's externalinput.php to filter out potential XSS attacks on user-supplied input. This filter, and the original, fail to fully sanitize user data.
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