Microsoft Releases Windows 10 KB5122878 Update for ESU and Enterprise LTSC
Summary
Microsoft released Windows 10 KB5122878 for ESU and Enterprise LTSC users, including September 2026 security fixes and fixes for Secure Boot, Remote Desktop audio, BitLocker policy, and other issues.
Key points
- The update is available to Windows 10 ESU and Enterprise LTSC users.
- It updates Windows 10 to build 19045.7725 and Enterprise LTSC 2021 to build 19044.7725.
- It includes September 2026 Patch Tuesday fixes, which the article says addressed 966 vulnerabilities across Microsoft products, including two actively exploited zero-days.
- Additional fixes cover Secure Boot certificate eligibility, Morocco Standard Time, OMA DM logging, Code Integrity policies, Remote Desktop audio redirection, and a BitLocker Group Policy issue.
- Microsoft reports no known issues with the update.
Article Details
- Event Type
- Release of an extended security update for Windows 10 ESU and Enterprise LTSC users.
- Impact
- KB5122878 includes September 2026 Patch Tuesday security fixes for 966 vulnerabilities across Microsoft products, including two actively exploited zero-day flaws, and fixes issues involving Secure Boot, time settings, OMA DM logging, Code Integrity policies, Remote Desktop audio redirection, and BitLocker Group Policy.
Vendors
Products
Windows 10Microsoft has released Windows 10 KB5122878 for ESU and Enterprise LTSC users, bringing September 2026 Patch Tuesday security fixes and several bug fixes.Windows 10 Enterprise LTSCIf you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a ‘Check for Updates.’