If you're running Mac OSX 10.13 or "High Sierra" a major security vulnerability was found that could allow anyone with physical access to your computer have full access to it.
What was found was that if you tried to log in with the username "root" and a blank password over and over again it would eventually let you in. In case you don't know "root" is Apple's equivalent of "administrator". So that person would have full permission once in to do what ever they like.
Since then, Apple has released a security update to patch the issue. So it is highly recommended that you check the App Store to make sure you are up to date on all security updates. To do this simply open the App Store and go to the "Updates" tab and install all of the updates until there's no updates available when you refresh the page by hitting command+R.
If you have anymore questions or concerns about your PC or Macs security feel free to reach out and let us know. That's what we're here for.
Tim Dixon is the owner of Solve IT Security.