The Microsoft September 2023 security updates have been released and consist of 59 new patches and 2 advisories. Of the CVEs released, 5 are rated critical, 55 are rated important and 1 is rated moderated in severity. At the time of release, one is listed as being under active attack and as publicly known.
The security updates apply to the following products, features and roles: Microsoft Windows and Windows Components; Exchange Server; Office and Office Components; .NET and Visual Studio; Azure; Microsoft Dynamics; and Windows Defender.
See the list of KBs at the bottom of the page at
September 2023 Security Updates - Release Notes - Security Update Guide - Microsoft for information regarding known issues with the security updates as well as the CVEs with FAQs, Mitigations and/or Workarounds. For specific information on Windows 11, version 22H2, see
KB5030129 and
KB5030217 for Windows 11, version 21H2. For Windows 10, Version 22H2 and 21H2, see
KB5030211.
Important: The September 2023 non-security preview update will be the last optional release for Windows 11, Version 21H2.
Recommended Reading: See Dustin Childs review and analysis in
Zero Day Initiative -- The September 2023 Security Update Review.
