While the steam powered forums now say they are in "maintenance", they were hacked in a way by a dude on Twitter named sputn1K_ He also attacked other places like Cube World forums and Day Z, as shown in his tweets. Since said person is openly admitting to attacking sites and pointing out the sites' flaws, the person could be one of those "hey, look how easy it is for me to get into your back door", or something else.
Indeed, much like the PS netwrok hackers (I forget their name), but on a lower scale! I hadn't heard this happened, but sucks to be them! I want you all to know that our forums are comprised of the highest level of security!