Microsoft Releases Windows 10 KB5126657 Extended Security Update
Summary
Microsoft released Windows 10 KB5126657 for Enterprise LTSC and ESU users. It includes October 2026 Patch Tuesday fixes, ReFS security controls, other fixes, and ongoing Secure Boot certificate deployment; some USB audio issues remain unresolved.
Key points
- The update takes Windows 10 to build 19045.7807 and Windows 10 Enterprise LTSC 2021 to build 19044.7807.
- It includes October 2026 Patch Tuesday fixes, which addressed 1,411 vulnerabilities across Microsoft products, including one actively exploited zero-day.
- For ReFS volumes on externally attached storage, auditing is enabled by default; enforcement controls are optional and disabled by default.
- The update also addresses Storage Spaces Direct recovery and File History backup or restore issues.
- Microsoft continues rolling out updated Secure Boot certificates to eligible devices.
- Some USB Audio Class 1.0 devices may still experience audio failures after the September updates; Microsoft says further fixes are in progress.
Article Details
- Event Type
- Microsoft released the Windows 10 KB5126657 extended security update.
- Impact
- The update includes security fixes and bug fixes, including fixes for File History and Storage Spaces issues and additional security controls for ReFS volumes on externally attached storage. It updates Windows 10 to build 19045.7807 and Windows 10 Enterprise LTSC 2021 to build 19044.7807. A known USB Audio Class 1.0 issue remains unresolved for some devices.
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File History[File History (known issue)] Fixed: This update addresses an issue where File History might fail to back up or restore files to an external drive or network location.ReFS[ReFS security] This update adds auditing and optional policy controls for ReFS volumes on externally attached storage devices.Secure Boot[Secure Boot] This update continues the deployment of updated Secure Boot certificates using the latest high-confidence targeting data to identify eligible devices that are ready to automatically receive the newStorage Spaces Direct[Storage Spaces] Addresses an issue that might cause some Storage Spaces Direct virtual disks to remain offline after installing a Windows update.Windows 10Microsoft releases Windows 10 KB5126657 extended security updateWindows 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.'Windows 10 Enterprise LTSC 2021After installing this update, Windows 10 will be updated to build 19045.7807, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7807.