Hello, Right today lot of xenforo games sites has been hacked today, like 4 sites, not sure how they did, people saying about something called "0day" there is nothing bad we did against our security, and really not sure how they have hacked all this sites, one of them are my site
The hacking reports we have been made aware of have been due to compromised passwords, server configuration/software, or other installed applications, such as WordPress.
If you are on shared hosting, it's also possible they managed to gain access via another account on the server.
We don't currently have anything to look into, because the methods used aren't exactly clear. It'd be like looking for a needle in a haystack. If any one has any further information, please open a ticket.