source: https://www.securityfocus.com/bid/16823/info

Website generator is prone to an arbitrary file-upload vulnerability. 

An attacker can exploit this vulnerability to upload arbitrary code and execute it in the context of the webserver process. This may facilitate unauthorized access or privilege escalation; other attacks are also possible.

http://www.example.com/files/myforms/process3.php?formname=attack.php%00*name[0]=