Following an intrusion on the Steam forums last weekend, Valve has since discovered that the breach runs deeper. Attackers gained access to a Steam database separate from the forums, which houses " user names, hashed and salted passwords, game purchases, email addresses, billing addresses and encrypted credit card information."
At this time, an investigation is still ongoing. Valve "does 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."
Moreover, there have been no reported cases of compromised Steam accounts and as such, Valve is not forcing users to change their passwords at this time.
"We don't have evidence of credit card misuse at this time[...]
Continue reading: Valve: Steam Hacked, User Database Compromised...