Recently there have been reports of people getting their Apple IDs hacked,
locking them out of their Apple devices like a MacBook iPhone, iPad, etc.

Hacked devices display information regarding how you can get back your "lost" device by contacting:

- passcode@gmx.com

- apple.pass@mail.com

It seems that this can happen due to three reasons:

• You have either "Find My Phone" or "Find My Mac" enabled.
• You are using Apple's 2-factor-authentication on your Apple ID.
• If the "hackers" know your Apple ID and current password.

What you should is change your password immediately if you are in this situation.

More information regarding the matter can be found on this link:
https://discussions.apple.com/docs/DOC-11911