Originally Posted by Brad Mitchell

I would phone your host or put an emergency ticket in. There is a recent cPanel exploit but it really could be any number of things - even just a technician error - if you have a shared hosting account and one of your hosts techs added a domain to your account instead of another one on the same server by accident. But, the worst case scenario is still the same - your account, or the whole server, might be compromised.

Good luck!

Brad