May 9, 2023—KB5026363 (OS Build 14393.5921) - EXPIRED

Highlights

• This update addresses security issues for your Windows operating system.

Improvements

This security update includes quality improvements. When you install this KB: 

• This update affects the Islamic Republic of Iran. The update supports the government’s daylight saving time change order from 2022.

• This update addresses an issue that affects the Key Distribution Center (KDC) service. When the service stops on a local machine, signing in to all local Kerberos fails. The error is STATUS_NETLOGON_NOT_STARTED.

• This update addresses an issue that affects Microsoft Edge IE mode. The issue stops you from configuring add-ons.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.  

For more information about security vulnerabilities, please refer to the new Security Update Guide website and the May 2023 Security Updates.

Known issues in this update

Microsoft is not currently aware of any issues with this update.

How to get this update

EXPIRATION NOTICE

IMPORTANT As of March 31, 2026, this update is no longer available from the Microsoft Update Catalog or other release channels. We recommend that you update your devices to the latest version of Windows.