This message appeared when I logged in today:
Dear Steam Users and Steam Forum Users,
Our Steam forums were defaced on the evening of Sunday, November 6. We began investigating and found that the intrusion goes beyond the Steam forums.
We learned that intruders obtained access to a Steam database in addition to the forums. This database contained information including user names, hashed and salted passwords, game purchases, email addresses, billing addresses and encrypted credit card information. We do not have evidence that encrypted credit card numbers or personally identifying information were taken by the intruders, or that the protection on credit card numbers or passwords was cracked. We are still investigating.
We don’t have evidence of credit card misuse at this time. Nonetheless you should watch your credit card activity and statements closely.
While we only know of a few forum accounts that have been compromised, all forum users will be required to change their passwords the next time they login. If you have used your Steam forum password on other accounts you should change those passwords as well.
We do not know of any compromised Steam accounts, so we are not planning to force a change of Steam account passwords (which are separate from forum passwords). However, it wouldn’t be a bad idea to change that as well, especially if it is the same as your Steam forum account password.
We will reopen the forums as soon as we can.
I am truly sorry this happened, and I apologize for the inconvenience.
The Hacker’s Message on Steam Forums
As part of the attack, this message was vandalized onto the Steam forums:
Ever wanted to dominate the servers you play on with guaranteed results, but you were too afraid to cheat because of ban risks? Visit Fkn0wned.com. It’s safe, secure and undetected. Along with hacks, we’ve also got some general discussion sections, hacking tutorials and tools, porn, free giveaways and much more. This site has been conditioned to meet all your needs in terms of resources so be sure to take a look and tell us what you think. Thanks again, the fkn0wned team.
Fkn0wned’s Denial of Responsibility for the Attack
“I can say I didn’t authorize anyone to do what happened so Fkn0wned shouldn’t be held responsible. If a member performs illegal actions in our name, there’s not much we can do about that other than to ask that member to stop. If a rival site is deliberately trying to bring us down by placing the attention of Valve’s legal department on us, there’s not much we can do about that either. It’s how this scene works and I’ll have to accept that.”