According to Valve, there's no evidence that any customer data was removed from their system.
If you're a PlayStation 3 owner then you're already familiar with this sort of thing thanks to a pretty significant data breach just a few months ago. Now it's come to the biggest digital distribution service of PC games.
Valve's Gabe Newell says that they initially discovered the issue when searching out the cause of an intrusion on the Steam forums. Apparently, the people that got into the forums also got into a database full of personal information. "This database contained information including user names, hashed and salted passwords, game purchases, email addresses, billing addresses and encrypted credit card information," writes Newell in an apology to Steam users.
"We do not have evidence that encrypted credit card numbers or personally identifying information were taken by the intruders," says Newell, "or that the protection on credit card numbers or passwords was cracked."
While there's no evidence that anything was taken, Newell still says it's a good idea to keep an eye on your credit card statements just in case.