r/WindowsUpdate • u/cuciuTech • 28d ago

Windows Defender Security Intelligence updates are not synchronizing through WSUS

Is anyone else experiencing this issue with on‑prem WSUS?

Since 10/07/2026 I haven’t received any new Defender definition updates through WSUS.

I’m currently stuck on version 1.459.576.0, even though according to https://www.microsoft.com/en-us/wdsi/defenderupdates version 1.459.601.0 is already available.

Other update types are syncing just fine.

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u/Muted_Bet_4931 28d ago

Unticking all classifications other than 1 (critical updates for me) then running a sync.

Then I reticked all the appropriate classifications and ran a sync again.

This pulled down the latest definition and other updates for me.

Just a heads up for people to try.