Battle.Net service was breached by hackers. That is the latest in gaming company hacking that has been going on for some time now. This is probably the biggest “success” to these pro hacker (as opposed to hacker wannabees), to get inside one of the gaming industry’s most security oriented company Blizzard Entertainment.
Yes, even those who are using Blizzard’s Mobile Authenticator are at risk. The company said that they are going to release an update to the Android and iOS authenticators soon, and then we are to relink the new version to our accounts. (Meaning, you have to unlink it and uninstall the app.)
Here are some information and the official statement of Blizzard Entertainment: