source: https://www.securityfocus.com/bid/20793/info
 
Exhibit Engine Software is prone to multiple remote file-include vulnerabilities because it fails to properly sanitize user-supplied input.
 
A successful exploit of these issues allows an attacker to execute arbitrary server-side script code on an affected computer with the privileges of the webserver process. This may facilitate unauthorized access.
 
Version 1.22 is vulnerable to these issues; other versions may also be affected.

http://www.example.com/fstyles.php?toroot=shell