Microsoft releases Windows 10 KB5122878 extended security update

As cited

Copy frozen at 2026-09-08 22:18 UTC (site build).

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Microsoft releases Windows 10 KB5122878 extended security update

Microsoft released Windows 10 KB5122878 as an extended security update on September 8, 2026, incorporating September 2026 Patch Tuesday fixes and addressing several bugs.

Why it matters: Windows 10 users need to apply this update to remediate vulnerabilities in this month's patches, particularly those still running Windows 10 after mainstream support ended.

Source published

2026-09-08 18:49 UTC

First seen by Cybersecurity Tracker

2026-09-08 21:50 UTC