KB5122878 (build 19045.7725) for Windows 10 ESU drops as the September 2026 update

Windows 10 receives a new ESU update with fixes and improvements, and continues to expand Secure Boot certificates.

Windows 10 KB5122878
Windows 10 KB5122878 / Image: Mauro Huculak
  • Windows 10 22H2 is getting build 19045.7725 (KB5122878) as the ninth update through the Extended Security Updates (ESU) program.
  • This cumulative update arrives with new critical security fixes and continues the Secure Boot certification update for more devices.
  • This release includes no new major features because operating system support ended on November 14, 2025.

Windows 10 builds 19045.7725 and 19044.7725 (KB5122878) are now rolling out as part of the September 2026 Security Update through the Extended Security Updates (ESU) program for versions 22H2 and 21H2.

This update improves security and compatibility while continuing the rollout of the Secure Boot certificates, Remote Desktop audio, BitLocker recovery prompts, and device-management logging.

These are the fixes and improvements rolling out this September for Windows 10:

  • Date and Time: Updated Morocco Standard Time to reflect the country’s transition to permanent UTC+00:00 on September 20, 2026, ensuring Windows displays the correct local time after the transition.
  • OMA DM protocol: Improved logging for the OMA DM Client (omadmclient.exe) component, which now saves additional debugging information when connecting to a server.
  • Windows Code Integrity policies: Improved application compatibility during the Windows certificate-authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.
  • Remote Desktop: Fixed an issue with Remote Desktop audio redirection that could prevent audio from a remote session from playing on the local computer in certain configurations.
  • BitLocker Group Policy: Fixed an issue that could require devices with an unrecommended BitLocker Group Policy configuration to enter their BitLocker recovery key.
  • Secure Boot: Added dynamic Secure Boot status reporting in the Windows Security app and expanded coverage for devices eligible to receive new Secure Boot certificates through Windows Update.

Older versions of Windows 10

Microsoft is also releasing updates for older operating system versions, including 1809 and 1607. For example, the company is rolling out update KB5122876 for version 1809, which bumps the build number to 17763.9245 and includes fixes and improvements for Date and Time, Windows Core Integrity policies, and Remote Desktop, and continues expanding Secure Boot certificates.

Finally, Windows 10 1607 receives update KB5123099, which bumps the build to 14393.9512, addresses similar issues as those for version 1809, and includes a fix for the Microsoft Compatibility Telemetry service.

Windows 10 September 2026 Patch Tuesday – Manual installation process

To download and install this Windows 10 build, open the “Windows Update” settings page and click the “Check for Updates” button.

Windows 10 September 2026 Patch Tuesday – Update history

  • Final Release – Patch Tuesday (Stable Channel):
    • Windows 10 22H2 build 19045.7725 release date: September 8, 2026. Official notes.
    • Windows 10 21H2 build 19044.7725 release date: September 8, 2026. (Same).

Windows 10 end of support

Support for Windows 10 ended on November 14, 2025, meaning the company is no longer providing security updates, bug fixes, features, or technical support. To continue receiving critical security updates (only), you must enroll your computer in the Extended Security Updates (ESU) program.

Also, remember that this lack of updates will leave your system vulnerable to security threats and may decrease its performance.

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Furthermore, since the software giant no longer provides updates, you should upgrade to Windows 11 or another operating system, such as Linux Mint, or plan to purchase a new device.

According to the company, all versions of Windows 10 have already reached the end of support, including:

  • Version 1507 (RTM)
  • Windows 10 2015 LTSB
  • Version 1511
  • Version 1607
  • Version 1703
  • Version 1709
  • Version 1803
  • Version 1809
  • Version 1903
  • Version 1909
  • Version 2004
  • Version 20H2
  • Version 21H1
  • Version 22H2

If you want to continue using Windows 10, Microsoft now offers Extended Security Updates (ESU). This service was originally reserved for organizations needing to run older operating systems beyond the official support period, but it is now also offered to regular consumers.

About the author

Mauro Huculak is a Windows How-To Expert and founder of Pureinfotech in 2010. With over 23 years as a technology writer and IT Specialist, Mauro specializes in Windows, software, and cross-platform systems such as Linux, Android, and macOS.

Certifications: Microsoft Certified Solutions Associate (MCSA), Cisco Certified Network Professional (CCNP), VMware Certified Professional (VCP), and CompTIA A+ and Network+.

Mauro is a recognized Microsoft MVP and has also been a long-time contributor to Windows Central.

You can follow him on YouTube, Threads, BlueSky, X (Twitter), LinkedIn and About.me. Email him at [email protected].

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