GoKawiilMicrosoft ships KB5122878 update for Windows 10 LTSC and ESU users
Microsoft has issued the KB5122878 update for Windows 10 Enterprise LTSC and machines enrolled in the Extended Security Updates program, bumping systems to build 19045.7725 (or 19044.7725 for LTSC 2021). The update bundles this month's Patch Tuesday security fixes plus smaller changes covering Secure Boot certificate rollout, a time-zone correction for Morocco, and diagnostic and compatibility tweaks.
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This is one of the last lifelines for Windows 10 devices still receiving official support, since Microsoft has stopped adding new features to the OS. The bundled Patch Tuesday fixes are especially significant given they address 966 vulnerabilities, including two zero-days already being exploited, making prompt installation important for organizations still relying on legacy Windows 10 systems.
- KB5122878 applies only to Windows 10 LTSC and ESU-enrolled devices.
- It rolls in September 2026's record Patch Tuesday fixes, covering 966 vulnerabilities and two active zero-days.
- Additional changes include Secure Boot certificate targeting, a Morocco time-zone fix, and certificate-authority compatibility improvements.
Microsoft Windows 11 Pro Full Version — If you're still nursing Windows 10 along with extended security updates, a retail Windows 11 Pro license is the clean way off the treadmill. It arrives as a full version you can install on a supported PC and keeps you on the mainstream Patch Tuesday track instead of ESU-only builds.
See Microsoft Windows 11 Pro Full Version on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: bleepingcomputer.com, 2026-09-08
Published there as: “Microsoft releases Windows 10 KB5122878 extended security update”
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