source: http://www.securityfocus.com/bid/7980/info

It has been reported that pMachine is prone to remote a patch disclosure vulnerability when accessing various scripts.

When a request is made for a target PHP script, possibly requiring a blank URI parameter, pMachine is said to throw an exception. When this occurs, the resulting error page discloses the installation directory of the respective PHP script. 

http://www.example.com/Path_To_pMachine/lib/weblog.add.php
http://www.example.com/Path_To_pMachine/lib/comment.add.php