source: http://www.securityfocus.com/bid/15348/info

toendaCMS is reported prone to a directory traversal vulnerability. It is demonstrated that this issue may be leveraged to disclose the contents of arbitrary web-server readable files.

A remote attacker may exploit this vulnerability to reveal files that contain potentially sensitive information.

Version 2.1 is vulnerable; earlier versions may also be vulnerable. 

http://www.example.com/engine/admin/admin.php?id_user=
../../../../../../etc/passwd 