September 14, 2026—KB5129195 (OS Builds 26200.9457 and 26100.9457) Out-of-band

1

Microsoft has released an update to fix Claude functionality that was broken in the 2026 September cumulative release.

Claude Status - Degraded functionality for Claude Cowork on Windows

Resolved

This issue has been resolved. Microsoft has released a September 14 Windows update that fixes it: https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5129195-windows-11-24h2-25h2-security-update

Posted 42 minutes ago. Sep 14, 2026 - 19:14 UTC

September 14, 2026—KB5129195 (OS Builds 26200.9457 and 26100.9457) Out-of-band | Microsoft Support

We are looking forward to getting this out ASAP. Do we have any timeline when this will be released to our consoles?

Thanks,

Scott

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We do have the team looking at it and I think we're anticipating a release later tonight

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There is an OOB version across the entire Windows stack - all servers too.

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Awiating those to be aviailable in Bigfix.

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The team is working on publication. Should be out soon.

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