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The September 2026 Windows security update requires a restart for hotpatch‑enabled devices

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
Windows
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What the notice says

Microsoft’s text, safely structured

What and why

The September 2026 Windows security update will be released as a standard update rather than a hotpatch update. Some of the security improvements in this update change components that cannot be updated without a restart. As a result, devices enrolled in hotpatching will need to restart to complete installation.

Rollout schedule

  • September 2026: Standard update with restart required for all devices including those that are hotpatch-enabled.
  • October 2026: Planned baseline update month with restart required.
  • November 2026: Next hotpatch update expected.

Impact on your organization

  • Hotpatch-enabled devices will require a restart to complete installation of the September 2026 security update.
  • Hotpatch-enabled devices will remain enrolled in hotpatch updates.
  • No change for devices not using hotpatch updates (standard updates already require restart).

Action required / recommendations

No additional configuration is required to stay enrolled in hotpatch updates.

Compliance considerations

No compliance action is required. Update installation and restart behavior will be reflected in update history and compliance reports as usual.

Additional information

You can track the hotpatch update calendars on the Windows release health site for both Windows 11 and Windows Server.

What changed

Between archive captures, newest first

The archive supplies one version of this notice.

Learn more

Links from the notice and their documentation checks

No related announcements were found in the saved public history. Check the source for newer announcements.

Not confirmed here

What this page cannot tell you
  • Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.
  • 1 linked page has not been read yet.
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