Content Release: October 2026 Security Updates published 2026-10-13

Release Announcements Patch (Release Announcements)
1

Content in the Patches for Windows site has been released.

New:

  • MAJOR [ID:512892802] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8 for Microsoft server operating system version 21H2 - Windows Server 2022 - .NET Framework 3.5/4.8 - KB5127687 (x64)
  • MAJOR [ID:512892801] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 21H2 - Windows Server 2022 - .NET Framework 3.5/4.8.1 - KB5127693 (x64)
  • MAJOR [ID:512892404] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 - Windows 10 Version 21H2 - .NET Framework 3.5/4.8.1 - KB5127689
  • MAJOR [ID:512892403] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 - Windows 10 Version 21H2 - .NET Framework 3.5/4.8.1 - KB5127689 (x64)
  • MAJOR [ID:512892402] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 21H2 - Windows 10 Version 21H2 - .NET Framework 3.5/4.8 - KB5127683 (x64)
  • MAJOR [ID:512892401] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 21H2 - Windows 10 Version 21H2 - .NET Framework 3.5/4.8 - KB5127683
  • MAJOR [ID:512892306] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1809 - Windows 10 Version 1809 - .NET Framework 3.5/4.8 - KB5127685 (x64)
  • MAJOR [ID:512892305] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10 Version 1809 - Windows 10 Version 1809 - .NET Framework 3.5/4.7.2 - KB5127666
  • MAJOR [ID:512892304] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1809 - Windows 10 Version 1809 - .NET Framework 3.5/4.8 - KB5127685
  • MAJOR [ID:512892303] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server 2019 - Windows Server 2019 - .NET Framework 3.5/4.8 - KB5127685 (x64)
  • MAJOR [ID:512892302] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10 Version 1809 - Windows 10 Version 1809 - .NET Framework 3.5/4.7.2 - KB5127666 (x64)
  • MAJOR [ID:512892301] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows Server 2019 - Windows Server 2019 - .NET Framework 3.5/4.7.2 - KB5127666 (x64)
  • MAJOR [ID:512889501] MS26-OCT: Security Update For Exchange Server Subscription Edition - Exchange Server 2025 - KB5128895 (x64)
  • MAJOR [ID:512849701] MS26-OCT: Security Update for SQL Server 2017 RTM GDR - SQL Server 2017 - KB5128497 (x64)
  • MAJOR [ID:512849601] MS26-OCT: Security Update for SQL Server 2017 RTM CU - SQL Server 2017 - KB5128496 (x64)
  • MAJOR [ID:512849501] MS26-OCT: Security Update for SQL Server 2019 RTM GDR - SQL Server 2019 - KB5128495 (x64)
  • MAJOR [ID:512849401] MS26-OCT: Security Update for SQL Server 2019 RTM CU - SQL Server 2019 - KB5128494 (x64)
  • MAJOR [ID:512849301] MS26-OCT: Security Update for SQL Server 2022 RTM GDR - SQL Server 2022 - KB5128493 (x64)
  • MAJOR [ID:512849201] MS26-OCT: Security Update for SQL Server 2025 RTM GDR - SQL Server 2025 - KB5128492 (x64)
  • MAJOR [ID:512769402] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 26H2 for ARM64 - Windows 11 Version 26H2 - .NET Framework 3.5/4.8.1 - KB5127694 (arm64)
  • MAJOR [ID:512769401] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 26H2 - Windows 11 Version 26H2 - .NET Framework 3.5/4.8.1 - KB5127694 (x64)
  • MAJOR [ID:512769202] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2 - Windows 11 Version 23H2 - .NET Framework 3.5/4.8.1 - KB5127692 (x64)
  • MAJOR [ID:512769201] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2 for ARM64 - Windows 11 Version 23H2 - .NET Framework 3.5/4.8.1 - KB5127692 (arm64)
  • MAJOR [ID:512769005] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 24H2 - Windows Server 2025 - .NET Framework 3.5/4.8.1 - KB5127690 (x64)
  • MAJOR [ID:512769004] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for ARM64 - Windows 11 Version 24H2 - .NET Framework 3.5/4.8.1 - KB5127690 (arm64)
  • MAJOR [ID:512769003] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 for ARM64 - Windows 11 Version 25H2 - .NET Framework 3.5/4.8.1 - KB5127690 (arm64)
  • MAJOR [ID:512769002] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 - Windows 11 Version 24H2 - .NET Framework 3.5/4.8.1 - KB5127690 (x64)
  • MAJOR [ID:512769001] MS26-OCT: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 - Windows 11 Version 25H2 - .NET Framework 3.5/4.8.1 - KB5127690 (x64)
  • MAJOR [ID:512768403] MS26-OCT: Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1607 - Windows 10 Version 1607 - .NET Framework 4.8 - KB5127684
  • MAJOR [ID:512768402] MS26-OCT: Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1607 - Windows 10 Version 1607 - .NET Framework 4.8 - KB5127684 (x64)
  • MAJOR [ID:512768401] MS26-OCT: Cumulative Update for .NET Framework 4.8 for Windows Server 2016 - Windows Server 2016 - .NET Framework 4.8 - KB5127684 (x64)
  • MAJOR [ID:512764806] MS26-OCT: Cumulative Update for Windows 11, version 26H2 for ARM64 - Windows 11 Version 26H2 - KB5127648 (arm64)
  • MAJOR [ID:512764805] MS26-OCT: Cumulative Update for Windows 11, version 24H2 for ARM64 - Windows 11 Version 24H2 - KB5127648 (arm64)
  • MAJOR [ID:512764804] MS26-OCT: Cumulative Update for Windows 11, version 24H2 - Windows 11 Version 24H2 - KB5127648 (x64)
  • MAJOR [ID:512764803] MS26-OCT: Cumulative Update for Windows 11, version 25H2 - Windows 11 Version 25H2 - KB5127648 (x64)
  • MAJOR [ID:512764802] MS26-OCT: Cumulative Update for Windows 11, version 26H2 - Windows 11 Version 26H2 - KB5127648 (x64)
  • MAJOR [ID:512764801] MS26-OCT: Cumulative Update for Windows 11, version 25H2 for ARM64 - Windows 11 Version 25H2 - KB5127648 (arm64)
  • MAJOR [ID:512696701] MS26-OCT: Security Update for SQL Server 2025 RTM CU - SQL Server 2025 - KB5126967 (x64)
  • MAJOR [ID:512693401] MS26-OCT: Security Update for SQL Server 2022 RTM CU - SQL Server 2022 - KB5126934 (x64)
  • MAJOR [ID:512686803] MS26-OCT: Cumulative Update for Windows 10 Version 1607 - Windows 10 Version 1607 LTSB - KB5126868 (x64)
  • MAJOR [ID:512686802] MS26-OCT: Cumulative Update for Windows Server 2016 - Windows Server 2016 - KB5126868 (x64)
  • MAJOR [ID:512686801] MS26-OCT: Cumulative Update for Windows 10 Version 1607 - Windows 10 Version 1607 LTSB - KB5126868
  • MAJOR [ID:512665702] MS26-OCT: Cumulative Update for Windows 10 Version 21H2 - Windows 10 Version 21H2 - KB5126657 (x64)
  • MAJOR [ID:512665701] MS26-OCT: Cumulative Update for Windows 10 Version 21H2 - Windows 10 Version 21H2 - KB5126657
  • MAJOR [ID:512665501] MS26-OCT: Cumulative Update for Microsoft server operating system version 21H2 - Windows Server 2022 - KB5126655 (x64)
  • MAJOR [ID:512665302] MS26-OCT: Cumulative Update for Windows 11, version 23H2 - Windows 11 Version 23H2 - KB5126653 (x64)
  • MAJOR [ID:512665301] MS26-OCT: Cumulative Update for Windows 11, version 23H2 for ARM64 - Windows 11 Version 23H2 - KB5126653 (arm64)
  • MAJOR [ID:512665103] MS26-OCT: Cumulative Update for Windows 10 Version 1809 - Windows 10 Version 1809 LTSC - KB5126651 (x64)
  • MAJOR [ID:512665102] MS26-OCT: Cumulative Update for Windows 10 Version 1809 - Windows 10 Version 1809 LTSC - KB5126651
  • MAJOR [ID:512665101] MS26-OCT: Cumulative Update for Windows Server 2019 - Windows Server 2019 - KB5126651 (x64)
  • MAJOR [ID:512664903] MS26-OCT: Servicing Stack Update for Windows Server 2016 - Windows Server 2016 - KB5126649 (x64)
  • MAJOR [ID:512664902] MS26-OCT: Servicing Stack Update for Windows 10 Version 1607 - Windows 10 Version 1607 - KB5126649 (x64)
  • MAJOR [ID:512664901] MS26-OCT: Servicing Stack Update for Windows 10 Version 1607 - Windows 10 Version 1607 - KB5126649
  • MAJOR [ID:512664601] MS26-OCT: Cumulative Update for Microsoft server operating system version 24H2 - Windows Server 2025 - KB5126646 (x64)
  • MAJOR [ID:500736500] MS26-OCT: Security Update for Microsoft Visual Studio 2022 version 17.14.42 - KB5007364
  • MAJOR [ID:500293402] MS26-OCT: Security Update for Microsoft Excel 2016 - Excel 2016 - KB5002934
  • MAJOR [ID:500293401] MS26-OCT: Security Update for Microsoft Excel 2016 - Excel 2016 - KB5002934 (x64)
  • MAJOR [ID:500292801] MS26-OCT: Security Update for Microsoft Office Online Server - Office Online Server - KB5002928 (x64)
  • MAJOR [ID:500292701] MS26-OCT: Security Update for Microsoft SharePoint Server Subscription Edition - Microsoft SharePoint Server Subscription Edition - KB5002927 (x64)
  • MAJOR [ID:50725374] MS26-OCT: Security Update for Microsoft Visual Studio 2026 version 18.10.4 - KB5072533

Superseded:

  • MAJOR [ID:500290801] MS26-SEP: Security Update for Microsoft SharePoint Server Subscription Edition - Microsoft SharePoint Server Subscription Edition - KB5002908 (x64) (Superseded)
  • MAJOR [ID:500291001] MS26-SEP: Security Update for Microsoft Office Online Server - Office Online Server - KB5002910 (x64) (Superseded)
  • MAJOR [ID:512276801] MS26-SEP: Security Update for SQL Server 2022 RTM CU - SQL Server 2022 - KB5122768 (x64) (Superseded)
  • MAJOR [ID:512276901] MS26-SEP: Security Update for SQL Server 2025 RTM CU - SQL Server 2025 - KB5122769 (x64) (Superseded)
  • MAJOR [ID:512277001] MS26-SEP: Security Update for SQL Server 2025 RTM GDR - SQL Server 2025 - KB5122770 (x64) (Superseded)
  • MAJOR [ID:512277101] MS26-SEP: Security Update for SQL Server 2022 RTM GDR - SQL Server 2022 - KB5122771 (x64) (Superseded)
  • MAJOR [ID:512277201] MS26-SEP: Security Update for SQL Server 2019 RTM CU - SQL Server 2019 - KB5122772 (x64) (Superseded)
  • MAJOR [ID:512277401] MS26-SEP: Security Update for SQL Server 2017 RTM CU - SQL Server 2017 - KB5122774 (x64) (Superseded)
  • MAJOR [ID:512277501] MS26-SEP: Security Update for SQL Server 2017 RTM GDR - SQL Server 2017 - KB5122775 (x64) (Superseded)
  • MAJOR [ID:512604701] MS26-SEP: Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1607 - Windows 10 Version 1607 - .NET Framework 4.8 - KB5126047 (Superseded)
  • MAJOR [ID:512604703] MS26-SEP: Cumulative Update for .NET Framework 4.8 for Windows Server 2016 - Windows Server 2016 - .NET Framework 4.8 - KB5126047 (x64) (Superseded)
  • MAJOR [ID:512604707] MS26-SEP: Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1607 - Windows 10 Version 1607 - .NET Framework 4.8 - KB5126047 (x64) (Superseded)
  • MAJOR [ID:512605201] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 24H2 - Windows Server 2025 - .NET Framework 3.5/4.8.1 - KB5126052 (x64) (Superseded)
  • MAJOR [ID:512605203] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 - Windows 11 Version 24H2 - .NET Framework 3.5/4.8.1 - KB5126052 (x64) (Superseded)
  • MAJOR [ID:512605205] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 for ARM64 - Windows 11 Version 25H2 - .NET Framework 3.5/4.8.1 - KB5126052 (arm64) (Superseded)
  • MAJOR [ID:512605207] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for ARM64 - Windows 11 Version 24H2 - .NET Framework 3.5/4.8.1 - KB5126052 (arm64) (Superseded)
  • MAJOR [ID:512605209] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 - Windows 11 Version 25H2 - .NET Framework 3.5/4.8.1 - KB5126052 (x64) (Superseded)
  • MAJOR [ID:512614401] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10 Version 1809 - Windows 10 Version 1809 - .NET Framework 3.5/4.7.2 - KB5126043 (Superseded)
  • MAJOR [ID:512614403] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows 10 Version 1809 - Windows 10 Version 1809 - .NET Framework 3.5/4.7.2 - KB5126043 (x64) (Superseded)
  • MAJOR [ID:512614405] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1809 - Windows 10 Version 1809 - .NET Framework 3.5/4.8 - KB5126048 (x64) (Superseded)
  • MAJOR [ID:512614407] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server 2019 - Windows Server 2019 - .NET Framework 3.5/4.8 - KB5126048 (x64) (Superseded)
  • MAJOR [ID:512614501] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 - Windows 10 Version 21H2 - .NET Framework 3.5/4.8.1 - KB5126421 (Superseded)
  • MAJOR [ID:512614503] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 - Windows 10 Version 21H2 - .NET Framework 3.5/4.8.1 - KB5126421 (x64) (Superseded)
  • MAJOR [ID:512614505] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 21H2 - Windows 10 Version 21H2 - .NET Framework 3.5/4.8 - KB5126046 (Superseded)
  • MAJOR [ID:512614507] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 21H2 - Windows 10 Version 21H2 - .NET Framework 3.5/4.8 - KB5126046 (x64) (Superseded)
  • MAJOR [ID:512614901] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 21H2 - Windows Server 2022 - .NET Framework 3.5/4.8.1 - KB5126422 (x64) (Superseded)
  • MAJOR [ID:512614903] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8 for Microsoft server operating system version 21H2 - Windows Server 2022 - .NET Framework 3.5/4.8 - KB5126050 (x64) (Superseded)
  • MAJOR [ID:512642403] MS26-SEP: Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2 - Windows 11 Version 23H2 - .NET Framework 3.5/4.8.1 - KB5126424 (x64) (Superseded)
  • MAJOR [ID:512919501] 5129195: Cumulative Update for Windows 11, version 25H2 for ARM64 - Windows 11 Version 25H2 - KB5129195 (arm64) (Superseded)
  • MAJOR [ID:512919502] 5129195: Cumulative Update for Windows 11, version 25H2 - Windows 11 Version 25H2 - KB5129195 (x64) (Superseded)
  • MAJOR [ID:512919504] 5129195: Cumulative Update for Windows 11, version 24H2 for ARM64 - Windows 11 Version 24H2 - KB5129195 (arm64) (Superseded)
  • MAJOR [ID:512919506] 5129195: Cumulative Update for Windows 11, version 24H2 - Windows 11 Version 24H2 - KB5129195 (x64) (Superseded)
  • MAJOR [ID:512923501] 5129235: Cumulative Update for Microsoft server operating system version 24H2 - Windows Server 2025 - KB5129235 (x64) (Superseded)
  • MAJOR [ID:512923601] 5129236: Cumulative Update for Windows 10 Version 21H2 - Windows 10 Version 21H2 - KB5129236 (x64) (Superseded)
  • MAJOR [ID:512923603] 5129236: Cumulative Update for Windows 10 Version 21H2 - Windows 10 Version 21H2 - KB5129236 (Superseded)
  • MAJOR [ID:512923701] 5129237: Cumulative Update for Microsoft server operating system version 21H2 - Windows Server 2022 - KB5129237 (x64) (Superseded)
  • MAJOR [ID:512923801] 5129238: Cumulative Update for Windows 10 Version 1809 - Windows 10 Version 1809 LTSC - KB5129238 (Superseded)
  • MAJOR [ID:512923802] 5129238: Cumulative Update for Windows Server 2019 - Windows Server 2019 - KB5129238 (x64) (Superseded)
  • MAJOR [ID:512923803] 5129238: Cumulative Update for Windows 10 Version 1809 - Windows 10 Version 1809 LTSC - KB5129238 (x64) (Superseded)
  • MAJOR [ID:512924201] 5129242: Cumulative Update for Windows 11, version 23H2 - Windows 11 Version 23H2 - KB5129242 (x64) (Superseded)
  • MAJOR [ID:512924202] 5129242: Cumulative Update for Windows 11, version 23H2 for ARM64 - Windows 11 Version 23H2 - KB5129242 (arm64) (Superseded)
  • MAJOR [ID:512995501] 5129955: Security Update For Exchange Server Subscription Edition - Exchange Server 2025 - KB5129955 (x64) (Superseded)

Reason for Update:

  • Microsoft released October security updates.

Additional Notes:

  • "HCL BigFix now officially supports Windows 11, Version 26H2."

Actions to Take:
None

Published site version:
Patches for Windows, Version: 4797

Additional links:

Application Engineering Team
HCL BigFix

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