According to a post on Bethesda’s official blog, the hackers may have gained access to some user names, email addresses and passwords.
“As a precaution, we recommend that all our fans immediately change passwords on all our sites,” reads the statement.
Bethesda also suggests users watch for suspicious emails and account activity.
The publisher says no personal financial information or credit card data was obtained.
Bethesda is the latest video game company to fall victim to an attempted intrusion. Gears of War developers Epic Games, publisher Square Enix and — most notable — Sony’s PlayStation Network have all been attacked by hackers this year.