Dangerous Script For Cpanel :-(

I am giving out some Sub Domains via CPANEL control Panel, but
recently, there is a script called: remview.php that can control
all over my site, all DB can be hacked anytime :-(
http://php.spb.ru/remview/
Let's say: You have a Domain AAA
you give out a Sub : sub.AAA.com
and then they upload that script on there...and they can control
all over that whole domain :-(

Thanks in advance
