About 350 million people use the Opera browser. Of those, 1.7 million received an email from Opera, warning that attackers breached Opera’s cloud Sync service server. Even if a person didn’t check their email, they would have known something was up since Opera forced a password reset for Sync users.
Opera announced the breach on Friday. The company said it detected and then “quickly blocked” an attack last week, but “some data, including some of our sync users’ passwords and account information, such as login names, may have been compromised.”