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source: http://www.securityfocus.com/bid/7779/info WebChat has been reported prone to a cross-site scripting vulnerability. WebChat does not adequately filter script code from URI parameters, making it prone to cross-site scripting attacks. Attacker-supplied script code may be included in a malicious link to the WebChat 'users.php' script. This may enable a remote attacker to steal cookie-based authentication credentials from legitimate users. Other attacks are also possible. This vulnerability was reported to affect WebChat version 2.0 other versions may also be affected. http://www.example.com/modules/WebChat/users.php?rid=Non_Numeric&uid=-1&username="><script>alert(document.cookie);</script>