If you own a Nintendo Switch and also own or owned a Nintendo 3Ds or Wii U, then there is a possibility that your Nintendo Switch account has been breached by hackers.
Nintendo first announced the breach in April for about 160K accounts, but it doubled the number of affected accounts in an update this week "as a result of continuing the investigation."
To be more specific, anyone who connected their old Nintendo 3DS and Wii U "Nintendo Network ID," or NNID, to the Switch may be amongst the 300.000 breached accounts. The breach happened due to a faulty online system that Nintendo uses called Nintendo Account, this allowed people with existing NNIDs to connect to their new Nintendo Account.
Nintendo said it no longer allows NNID logins on the Switch.
If your account was breached, you'll likely know soon by receiving an email like this:
Nintendo is also alerting affected users by forcing a password reset.
"As a further precaution," Nintendo said, "we will soon contact users about resetting passwords for Nintendo Network IDs and Nintendo Accounts that we have reason to believe were accessed without authorization."
Going forward, the company suggests doing two things to make your accounts more secure.
First, you should change the passwords associated with both your Nintendo Account and your Nintendo Network ID. Second, you should set up two-factor authentication, which adds an extra layer of security on top of a password.