Windows 10 22H2 KB5122878
Windows 10 build 19045.7725 (KB5122878) is the September 2026 cumulative security update. It includes the latest Windows security fixes together with quality improvements affecting Secure Boot certificate deployment, Windows Code Integrity policies, Remote Desktop audio redirection, BitLocker Group Policy behavior, OMA DM logging, and time-zone handling. Microsoft reports no known issues with this update.
- Includes the September 2026 security fixes for supported Windows 10 servicing scenarios.
- Expands high-confidence device targeting for automatic deployment of new Secure Boot certificates.
- Improves application compatibility during Windows certificate authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.
- Includes servicing stack improvements through KB5122877 to improve Windows Update reliability.
What's new
Microsoft Windows 10 build 19045.7725 (KB5122878) is the September 2026 cumulative security update for Windows 10 version 22H2.
What's new- Includes the latest Microsoft security fixes and quality improvements.
- Expands eligible device targeting for automatic deployment of new Secure Boot certificates.
- Improves Windows Code Integrity policy compatibility during the Microsoft certificate authority transition to Production PCA 2026.
- Fixes an issue where Remote Desktop audio redirection could fail to play remote-session audio on the local device.
- Fixes a known BitLocker Group Policy issue that could unexpectedly require users to enter BitLocker recovery keys.
- Improves OMA DM Client logging by providing additional diagnostic information when connecting to management servers.
- Updates Morocco Standard Time to reflect Morocco's transition to permanent UTC+00:00 beginning September 20, 2026.
Microsoft currently reports no known issues with this update.
RecommendationOrganizations running eligible Windows 10 systems should deploy KB5122878 through their standard security update process after normal validation. Particular attention should be given to BitLocker, Secure Boot, Remote Desktop, and device-management workflows during pilot testing.
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