The success of such an attack relies on people’s tendency to reuse passwords across multiple online accounts.

Attackers would also have access to any credit card details or secure notes saved in your vault.

Personal data that may have been compromised includes Norton users' full names, phone numbers and mailing addresses.

Start with the most important accounts first, like anything related to finances, work or health.

But what about Norton users who haven’t been notified that they’ve been targeted?

To be as safe as possible, the same routine applies, unfortunately.

At the very least, immediately change your main Norton passwords.

But the safest thing to do is to change underlying passwords and flip on two-factor authentication.

Norton is also offering access to credit monitoring services for affected users, according to its letter to customers.

You might also consider trying a different password manager.

CNET’s list of thebest password managershighlights a few alternatives to Norton’s.

The number has always been approximately 8,000, according to Gen.