If you're using Apple's latest macOS High Sierra, you'll want to be wary of giving people access to your computer. Initially tweeted by developer Lemi Orhan Ergin, there's a super-easy exploit that can give anyone gain admin (or root) rights to your Mac. Engadget has confirmed that you can gain root access in the login screen, the System Preferences Users & Groups tab and File Vault with this method. All you need to do is enter "root" into the username field, leave the password blank, and hit Enter a few times. Needless to say, this is some scary stuff.