Out of interest I just had my chatroom hacked. I then (stable door, horse etc) looked up exploits and found this:
http://www.exploit-db.com/exploits/14658/
Given that it took me to point out the gaping hole in their forum integration security, and the severity of these exploits if true, I have lost confidence in 123FC and will be switching to a different system. A bloody shame after so much work and my users like it, but weak security is simply not acceptable.