source: http://www.securityfocus.com/bid/34722/info

MataChat is prone to multiple cross-site scripting vulnerabilities because it 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 and to steal cookie-based authentication credentials. 

http://www.example.com/[path]/input.php?nickname=[XSS]&color=[XSS] 