Zoom Client for Meetings through 4.6.8 on macOS has the disable-library-validation entitlement, which allows a local process (with the user's privileges) to obtain unprompted microphone and camera access by loading a crafted library and thereby inheriting Zoom Client's microphone and camera access.
https://www.tenable.com/cyber-exposure/2020-threat-landscape-retrospective
https://objective-see.com/blog/blog_0x56.html
https://blog.zoom.us/wordpress/2020/04/01/a-message-to-our-users/