This security update includes fixes and quality improvements that are part of the following updates: September 9, 2025—KB5065429 (OS Builds 19044.6332 and 19045.6332) September 25, 2025—KB5066198 (OS Build 19045.6395) Preview The following is a summary of the issues that this update addresses when you install this update. If there are new features, it lists them as well. The bold text ...

On the left side of this page, you’ll find a list of all the updates released for this version of Windows. You can also find more information about releases and any known issues. Installing the most recent update ensures that you also get any previous updates you might have missed, including any important security fixes.

This cumulative update for Windows 11, version 23H2 (KB5073455), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For ...

This out-of-band update for Windows 11, version 23H2 (KB5077797) is cumulative. It includes updates from previous security releases, along with an additional fix. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update ...

This cumulative update for Windows Server 2025 (KB5072033), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information ...

Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and ...

To install this update, use one of the following Windows and Microsoft release channels. This update downloads and installs automatically from Windows Update and Microsoft Update. This update downloads and installs automatically from Windows Update for Business in accordance with configured policies.

This cumulative update for Windows Server 2022 (KB5073457), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information ...

KB identifier changes for Windows Server 2025 starting January 2026 Windows Secure Boot certificate expiration Improvements This security update contains fixes and quality improvements from KB5072033 (released December 9, 2025). The following summary outlines key issues addressed by this update. Also, included are available new features.

This security update includes fixes and quality improvements that are part of the following updates: December 9, 2025—KB5071546 (OS Builds 19045.6691 and 19044.6691) December 18, 2025—KB5074976 (OS Builds 19044.6693 and 19045.6693) Out-of-band The following is a summary of the issues that this update addresses when you install this update. If there are new features, it lists them as well ...