It addressed several critical vulnerabilities, including CVE-2023-44487 (an HTTP/2 "Rapid Reset" attack) and other zero-day vulnerabilities like CVE-2023-36563 (Microsoft WordPad) and CVE-2023-41763 (Skype for Business).

The update can be uninstalled via:

As this is a Patch Tuesday release, it will likely install automatically if you have Windows Update enabled. To force the install: