Microsoft Windows Autopatch: September 2026 Windows security update requires a restart for hotpatch-enabled devices

🚨 The Signal: A September 2026 Windows security update will require a restart for hotpatch-enabled devices, breaking the usual no-restart hotpatching cycle. This ensures critical security improvements are fully applied, maintaining system integrity.

The Impact

Organizations using Windows Autopatch with hotpatch-enabled devices are affected, with a minor risk of delayed patching if restarts are not managed.

• Hotpatch users: Temporary disruption due to mandatory restart for a specific security update.
• IT Admins: Need to plan and communicate a mandatory restart for hotpatch-enabled devices.
• Security Teams: Ensure timely application of the update to maintain security posture.

The Action

1. Review existing maintenance windows and device restart policies for September 2026.
2. Communicate to affected users that a restart will be required for the September 2026 security update.
3. Monitor device compliance to ensure the September 2026 update is applied post-restart.

Domain: Intune · Impact: low · Workload: Other · Essential Eight: Patch Operating Systems · ISM: ISM-1407, ISM-1501, ISM-1621, ISM-1622, ISM-1623, ISM-1654, ISM-1655, ISM-1694, ISM-1695, ISM-1696, ISM-1701, ISM-1702, ISM-1877, ISM-1889, ISM-1902