Apple has just released a security update for macOS High Sierra and you should update right now (Apple will automatically push the security patch later today). This update fixes yesterday’s very concerning vulnerability that let anyone log into your Mac without your password.
In order to install the update, open the Mac App Store and click on the “Updates” tab. Interestingly, the release notes say “install this update as soon as possible.” Apple has worked long hours to fix yesterday’s flaw as soon as possible. But it shouldn’t have happened in the first place.
