If so, there is a vulnerability that allows people to unlock your computer without a password -AND- gives them ‘superuser’ permissions.
Apple has a temporary fix on their website until the release a patch closing this vulnerability.
In the meantime, do not allow anyone you don’t trust completely to have access to your Mac if you have critical information for your business (or private data for you and your family).

Original Story
Apple page
Author: Will Eckrich
Will served for 24 years in the United States Air Force filling many roles to include computer programmer, database administrator, network manager, and project manager. He earned a Bachelor’s in Computational Science from the University of South Carolina–Beaufort. He is now the CEO of Eckrich Enterprises, an IT Consulting Firm. Additionally, Will is the author of the A Timeline Of: book series.
View all posts by Will Eckrich