Available for: macOS High Sierra 10.13.1Not impacted: macOS Sierra 10.12.6 and earlier Impact: An attacker may be able to bypass administrator authentication without supplying the administrator’s passwordDescription: A logic error existed in the validation of credentials. This was addressed with improved credential validation.CVE-2017-13872When you install Security Update 2017-001 on your Mac, the build number of macOS will be 17B1002. Learn how to find the macOS version and build number on your Mac.If you require the root user account on your Mac, you can enable the root user and change the root user's password.