source: http://www.securityfocus.com/bid/56777/info

The Zingiri Forums plugin for WordPress is prone to a local file-include vulnerability because it fails to sufficiently sanitize user-supplied input.

An attacker can exploit this vulnerability to view files and execute local scripts in the context of the web server process. This may aid in further attacks. 

http://www.example.com/wp-content/plugins/zingiri-forum/mybb/memberlist.php?language=[Directory or file]