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source: http://www.securityfocus.com/bid/15342/info XMB is prone to a cross-site scripting vulnerability because the application fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. A successful exploit could allow an attacker to steal cookie-based authentication credentials and launch other attacks. http://www.example.com/u2u.php?action=send&username=[code]