source: http://www.securityfocus.com/bid/36168/info

VideoGirls is prone to multiple cross site scripting vulnerabilities because the application fails to sufficiently sanitize user-supplied data.

Attacker-supplied HTML or JavaScript code could run in the context of the affected site, potentially allowing the attacker to steal cookie-based authentication credentials; other attacks are also possible. 

http://www.example.com/forum.php?ftid=2&t="><script>alert(document.cookie);</script>