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  • May 9, 2023—KB5026363 (OS Build 14393.5921)


    May 9, 2023—KB5026363 (OS Build 14393.5921)

    Windows 10, version 1607, all editions Windows Server 2016, all editions

    Release Date:



    OS Build 14393.5921

    For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of  Windows 10, version 1607, see its update history page.  


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


    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

    Before installing this update

    Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security updates. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions

    If you are using Windows Update, the latest SSU (KB5023788) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog

    Install this update

    Release Channel


    Next Step

    Windows Update and Microsoft Update


    None. This update will be downloaded and installed automatically from Windows Update.

    Windows Update for Business


    None. This update will be downloaded and installed automatically from Windows Update in accordance with configured policies.

    Microsoft Update Catalog


    To get the standalone package for this update, go to the Microsoft Update Catalog website.

    Windows Server Update Services (WSUS)


    This update will automatically sync with WSUS if you configure Products and Classifications as follows:

    Product: Windows 10

    Classification: Security Updates


    File information

    For a list of the files that are provided in this update, download the file information for cumulative update 5026363.

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