Microsoft releases Windows 10 KB5122878 extended security update
Microsoft has released the Windows 10 KB5122878 extended security update, which includes this month's record-breaking September 2026 Patch Tuesday fixes, along.
By Dillip Chowdary • Sep 30, 2026 • Source: BleepingComputer
What Microsoft Windows 10 KB5122878 extended shipped
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BleepingComputer reports: Microsoft releases Windows 10 KB5122878 extended security update. 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. [...]
How to install or upgrade Microsoft Windows 10 KB5122878 extended
For primary quotes and complete technical detail, see BleepingComputer's original report linked above.
Developer Action Items
- ☐ Diff the official changelog for Microsoft / Windows before you bump — APIs, defaults, and removed flags only.
- ☐ Install through the vendor's documented channel in staging; keep a one-command rollback and time-box the canary.
- ☐ Grep your repo for old flag names, lockfile pins, and plugin versions that the notes mark as breaking.
- ☐ Prefer the first patch cut over the day-zero tag unless you have a reason to be on the leading edge.
- ☐ If BleepingComputer did not name a region, plan, or SKU, screenshot the official availability line before you promise it to users.
Author
Dillip Chowdary
Writes Tech Bytes coverage of AI, engineering, and the tools that actually ship. Editor of Tech Pulse Daily.
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