Apple has released MacOS Monterey 12.0.1 with fixes for at least 40 security issues.
Apple has also released security updates for MacOS Big Sur and MacOS Catalina, along with an update for Safari 15.1 that should be installed using the Mac App Store.
These updates contain fixes for critical vulnerabilities that could be exploited to take control of a vulnerable system.
Users should update as soon as possible to avoid potential exploitation.
Important links for MacOS Big Sur and MacOS Catalina users:
How to update MacOS
Big Sur 11.6.1 Release Notes
Security Update 2021-007 Catalina Release Notes
How to update Safari
Safari 15.1 Release Notes