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Microsoft releases Windows 10 KB5122878 extended security update

2026-09-08 | original
read original get Microsoft Windows 11 Pro Full Version → more articles
Why This Matters

Windows 10 is now firmly in maintenance-only mode, with KB5122878 delivering security fixes exclusively to Enterprise LTSC users and those paying for Extended Security Updates. The update carries a record September 2026 Patch Tuesday load of 966 patched vulnerabilities, including two actively exploited zero-days, underscoring that unenrolled Windows 10 machines are accumulating serious risk.

Key Takeaways
Worth a Look

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Microsoft has released the Windows 10 KB5122878 extended security update, which includes this month's record-breaking September 2026 Patch Tuesday fixes, along with a few bug fixes.

If 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 KB5122878 update

Source: BleepingComputer

After installing this update, Windows 10 will be updated to build 19045.7725, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7725.

What's new in Windows 10 KB5122878

Microsoft is no longer releasing new features for Windows 10, and the KB5122878 update primarily contains security updates and bug fixes.

The update also includes fixes released as part of today's record-breaking September 2026 Patch Tuesday, which fixed a massive 966 vulnerabilities across Microsoft's products, including two actively exploited zero-day flaws.

The complete list of fixes in KB5122878 is listed 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.

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Explore topics: windows 10 kb5122878 microsoft patch tuesday secure boot
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