Our good friend Locutus from WePlayCiv noticed us about a recent event: The steam forums were hacked last saturday, and now it seems the hackers also gained access to Steam itself and were able to access user names, email addresses, hashed update and salted /update passwords, billing addresses and encrypted credit card information. The current status is that neither the passwords nor the credit card information has been cracked yet.
Every steam user, which includes every Civilization 5 user and partially also Civ3 and Civ4 users, are adviced to change their passwords and to keep an eye on their bank accounts.
For external information please see Kotaku or RockPaperShotgun.
Update: Concerned users might want to activate Steam guard, for more information please see here.
Thanks to Maniacal for these additions.
Please see this thread for further discussion.
