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Microsoft October 2023 Security Updates


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The Microsoft October 2023 security updates have been released and consist of 103 new patches. Of the CVEs released, 13 are rated critical, and 90 are rated important in severity. At the time of release, two of the CVEs are 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; ASP.NET Core and Visual Studio; Azure; Microsoft Dynamics; and Skype for Business.


See the list of KBs at the bottom of the page at October 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 KB5031354 and KB5031358 for Windows 11, version 21H2. For Windows 10, Version 22H2 and 21H2, see KB5031356.


IMPORTANT The October 2023 security update is the last security release for some editions of Windows 11, version 21H2. Windows 11, version 22H2 will continue to receive security and optional releases.


Recommended Reading: See Dustin Childs review and analysis in Zero Day Initiative -- The September 2023 Security Update Review.

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