server hacked ?

good evening

I have some customers on my server that uses vbulletin forums on their web sites , but yesterday two of them got hacked by someone , and he said to one of them that he can hack the whole server not just his forum .

I've talked to my administrator and he said that everything is ok and the server is secure .

the php safe mode is on also we don't allow shell access , and now i'm planning to disable cgi on the server .

please tell me what to do .

note : there lot's of web sites that uses vbulletin on the same server but doesn't get hacked .

Thank you in advance

 

 

 

 

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