May 12, 2020—KB4556799 (OS Builds 18362.836 and 18363.836)

Á við um: Windows 10, version 1903, all editionsWindows Server version 1903Windows 10, version 1909, all editions

Highlights


  • Updates to improve security when using Internet Explorer and Microsoft Edge.
  • Updates to improve security when using input devices such as a mouse, keyboard, or stylus.
  • Updates for verifying usernames and passwords.
  • Updates to improve security when using Microsoft Xbox.
  • Updates to improve security when Windows performs basic operations.
  • Updates for storing and managing files.
  • Updates to improve security when using Microsoft Office products.

Improvements and fixes


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

    For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

     

    Known issues in this update


    Symptom Workaround
    We have seen social media and news reports related to various issues with KB4556799.

    We are actively engaged with customers who are reporting issues. To date, we have not seen widespread issues reflected in telemetry, support data, or customer feedback channels. We continuously investigate all customer feedback and are closely monitoring this situation.

    Note If you experience any issues, we'd like to know. Please provide feedback using the keyboard shortcut Windows + F or go to the Start menu and select Feedback Hub so that we can investigate.
    After installing this update on a Windows 10 device with a wireless wide area network (WWAN) LTE modem, reaching the internet might not be possible. However, the Network Connectivity Status Indicator (NCSI) in the notification area might still indicate that you are connected to the internet. We are working on a resolution and will provide an update in an upcoming release.

     

    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 fixes. 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 (KB4552152) 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 Available Next Step
    Windows Update and Microsoft Update Yes None. This update will be downloaded and installed automatically from Windows Update.
    Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website. 
    Windows Server Update Services (WSUS) Yes

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

    Product: Windows 10, version 1903 and later

    Classification: Security Updates

     

    File information

    For a list of the files that are provided in this update, download the file information for cumulative update 4556799

    Note Some files erroneously have “Not applicable” in the “File version” column of the CSV file. This might lead to false positives or false negatives when using some third-party scan detection tools to validate the build.