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source: http://www.securityfocus.com/bid/4165/info Powie PForum is web forum software, written in PHP and back-ended by MySQL. It will run on most Unix and Linux variants, as well as Microsoft Windows operating systems. PForum is prone to cross-site scripting attacks. It is possible for an attacker to construct a malicious link which includes arbitrary script code. In particular, the username URL parameter does not filter variations of HTML tags. A legitimate user who browses the malicious link will have the attacker-supplied script code executed in their browser, in their context of the website running the vulnerable software. This may enable an attacker to steal cookie-based authentication credentials from the legitimate user. http://www.server.com/pforum/edituser.php?boardid=&agree=1 &username=%3Cscript%3Ealert(document.cookie)%3C/script%3E &email@example.com&pwd=test&pwd2=test&filled=1