The Microsoft December 2022 security updates have been released and consist of 52 new CVEs. Of these CVEs, 6 are rated critical, 43 important, and 3 are rated moderate in severity. At the time of release, one is listed as publicly known and one as being in the wild.
The security updates apply to the products, features, and roles shown in the Release Notes. Also included at the bottom of the page in the Release Notes is a long list of KBs with information regarding known issues with the security updates as well as the CVEs with FAQs, Mitigations and/or Workarounds.
As of December 13, 2022, all editions of Windows 10, version 21H1 have reached end of servicing. The December 2022 security update is the last update available for this version. Devices running this version will no longer receive monthly security and preview updates containing protections from the latest security threats.
Windows 8.1 will reach the end of support January 10, 2023. The December 13, 2022 security update will be the last update available for this version. After that date, devices running this version will no longer receive monthly security and quality updates.
Recommended Reading: See Dustin Childs review and analysis in Zero Day Initiative -- The December 2022 Security Update Review.