Did they rank themselves or not? You should look into your user database and find the guy and ip block him from your website.claimed
All I can advise is to change database/vps/hotel login password. IP Block them from the hotel and use a more secure custom theme for the time being.They ranked themselves. And used the hotel alert command. I'm using Revcms and using custom-habbo theme.
I also patched exploits up from that thread you provided.
How did you patch this?Uhm, Maybe it's the Forgot Password then.. Read the thread Sakura mention and figure out how to delete/remove it.