Apple has released security updates to fix 12 security issues for MacOS.

Safari 15 for MacOS Big Sur and MacOS Catalina fixes 4 security issues and should be installed by updating MacOS.

Xcode 13 for MacOS Big Sur 11.3 and later fixes 8 security issues and 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 users:
How to update Safari for MacOS Big Sur
Safari 15 Release Notes
How to update Xcode
Xcode 13 Release Notes

Important links for MacOS Catalina users:
How to update Safari for MacOS Catalina
Safari 15 Release Notes