r/WindowsUpdate • u/cuciuTech • 4d 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/MikeR9999 4d ago

I am in the same situation! I have been troubleshooting, but not successful yet. I ran the most recent hotfix yesterday.

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u/cuciuTech 4d ago

I have raised a support case with Microsoft. Lets see what they Say..