Windows 10 KB5122878 September 2026 Patch Tuesday Update Is Out Now

In addition to releasing September 2026 Patch Tuesday updates for Windows 11, Microsoft has also pushed Extended Security Update (ESU) KB5122878 for Windows 10 version 22H2 and 22H1. The latest monthly security update bumps the OS build number to 19045.7725 and 19044.7725 for Windows 10 version 22H2 and 21H2, respectively.

You can check the changelog for the KB5122878 September 2026 Patch Tuesday update below:

• [Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
• [Date and Time] This update adjusts Morocco Standard Time to reflect Morocco’s transition to permanent UTC+00:00 effective September 20, 2026. This change ensures that the correct local time is displayed after the transition.
• [OMA DM protocol] This update improves the logging features of the OMA DM Client (omadmclient.exe) component. More debug information is now saved when connecting to a server.
• [Windows Code Integrity policies] Improves application compatibility during Windows certificate-authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.
• [Remote Desktop] This update addresses an issue that affects Remote Desktop audio redirection. Audio from the remote session might not play on the local computer in certain configurations.
• [BitLocker Group Policy] This update addresses the “Devices with an unrecommended BitLocker Group Policy configuration might be required to enter their BitLocker recovery key” known issue.

Microsoft has confirmed that it’s not aware of any issue with this update. Speaking of installation, the KB5122878 security update should be installed on your system for you automatically via Windows Update only if you are enrolled to ESU program. Speaking of which, Microsoft recently extended Windows 10 ESU enrollment until October 2027, and surprisingly didn’t promote Windows 11 upgrade in emails sent to users.