Microsoft has released the latest extended security update for Windows 10 in the form of the KB5122878 update.

Windows 10 KB5122878 is out with the September 2026 Patch Tuesday update, bringing security improvements and important fixes.

Microsoft’s consumer ESU program includes a no-cost enrollment option for eligible Windows 10 PCs, but managed devices and some account setups are excluded. Millions of Windows 10 PCs now have a ...