source: http://www.securityfocus.com/bid/6893/info

Sage Content Management System contains a path disclosure vulnerability. When a request is made for a module that does not exist, the returned error message contains the full path to the Sage installation directory.

Disclosed path information could be used to launch further attacks against the system. 

http://hostname/?mod=some_thing&op=browse

http://hostname/?mod=node&nid=some_thing&op=view