source: http://www.securityfocus.com/bid/22670/info

Pheap is prone to a directory-traversal vulnerability because it fails to properly sanitize user-supplied input.

An attacker can exploit this vulnerability to retrieve and edit the contents of arbitrary files from the vulnerable system in the context of the affected application. 

http://www.example.com/edit.php?em=file&filename=../../../../../../../../../../../../../etc/passwd 