If you do not use a Mac computer running macOS High Sierra (e.g., a Windows PC, or earlier versions of macOS), you can disregard this message. Mac users can check the current version of their operating system by clicking into the Apple Menu, and selecting "About This Mac".
Earlier this week a vulnerability was identified in all versions of macOS High Sierra (10.13+) that allowed users access to administrative features of the system by using a blank password with the default administrator account. On Wednesday Apple released a security update for the vulnerability through the Mac App Store (click here for details), and is pushing the update through their standard update process for systems running version 10.13.1.
This is a required security patch for all macOS High Sierra users. Computers still running version 10.13 of High Sierra may have to update to version 10.13.1 in order for the update to be available. Users can update through the Mac App Store by following the instructions on Apple's website.
If you have any questions, contact the CaTS Help Desk at (937) 775-4827, or email firstname.lastname@example.org.