Baseline Month
Note
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.
The September 2026 security baseline will be available starting September 8, 2026. For more information, see KB5122871.
To learn more about release cadence, see Release notes for Hotpatch on Windows Server 2025 Datacenter Azure Edition.
Note: Windows Server 2025 Datacenter & Standard machines that are connected to Azure Arc, now have the option to subscribe to hotpatch servicing. Hotpatch provides the ability to install OS security updates without restarting your machine. To learn more, see Hotpatch for Windows Server.