If you are a user of the cloud storage system Dropbox, you need to log in and change your password.

Dropbox has acknowledged usernames and passwords were stolen from a third-party service.

Hackers claim they have 7 million usernames and passwords and have been posting them on websites including Pastebin and Reddit.

Dropbox said most of the passwords had expired and it has forced a password reset on the rest.

If you are a user of Dropbox, you should also turn on two-factor authentication. This will require you to input a code that was sent to your phone before gaining access to your account from a new device.

Dropbox have been sending emails to the users in the Pastebin “dump” but even if you haven’t been compromised, changing your password and turning on two-factor authentication will protect you in the long run.