Houston, we have a problem. macOS High Sierra was found to have a bug that can give anyone access to your computer without a password! "We are working on a software update to address this issue." Apple spokesperson said in a statement "In the meantime, setting a root password prevents unauthorized access to your Mac." If a user gains administrative access to your computer, that person would be able to download malicious software. "If a Root User is already enabled, to ensure a blank password is not set…" Apple spokesperson "please follow the instructions from the 'Change the root password' section."