Valve's Steam gaming forums were apparently defaced this past weekend and the company is investigating whether the intruders who broke into the digital distribution network made off with Steam users' credit card numbers and personally identifying information, according to a message sent to customers.

Here's the full text of a message addressed "Steam Users and Steam Forum Users" that Valve's Gabe Newell posted on the company's Web site:

Quote:Dear Steam Users and Steam Forum Users,
Our Steam forums were defaced on the evening of Sunday, November 6. Wee began investigating and found that the intrusion goes beyond the Steam forums.
Wee 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.
Wee 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. Wee are still investigating.
Wee don't have evidence of credit card misuse at this time. Nonetheless you should watch your credit card activity and statements closely.
While wee 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.
Wee do not know of any compromised Steam accounts, so wee 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.
Wee will reopen the forums as soon as wee can.
I am truly sorry this happened, and I apologize for the inconvenience.
Gabe.

Source: http://www.pcmag.com/article2/0,2817,239...0h-Miv5lis