We discuss the recent serious vulnerability that affects macOS High Sierra, which prompted Apple to rush out a security update. We explain what this means, and how important it is to keep your Mac up to date. “I Am Root”: A Retrospective on a Severe Mac Vulnerability The "sudo" command (Wikipedia) (https://en.wikipedia.org/wiki/Sudo) High Sierra Root Login Bug Was Mentioned on Apple’s Support Forums Two Weeks Ago (https://daringfireball.net/2017/11/high_sierra_root_login_two_weeks_ago) Contact Apple About Security Issues (https://support.apple.com/HT201220) About the security content of Security Update 2017-001 (https://support.apple.com/HT208315) Behind iPhone's Critical Security Bug, a Single Bad 'GOTO' (https://www.wired.com/2014/02/gotofail/) Get 50% off Intego's Mac Premium Bundle X9 with the code PODCAST19. Download now and try it for free at intego.com.