vBulletin exploite lost me entire site.

[CoryNickerson]

This guys like 42 years old and he hes a PHP developer and "hacker" so I'm told. He runs a site about hacking on the side. He knew my friend which led him to me, and since he knows an exploit to vB 3.6.8 he took down the site, deleted all the files to the system, and changed index.php to say "site was pwned by psychomarine".

http://www.enigmagroup.org/forums/in...ic,2852.0.html

Theres thread on his forums where hes talking about it. Its just sad to see people behave like this. I'm not sure how to find out what the exploit is or how to fix it, but apparently he can take down any site using vBulletin because its insecure he said.

Any thing we can do about this?

Please help.