Cumulative Update KB4056891 Windows 10 v1703 Build 15063.850

    Cumulative Update KB4056891 Windows 10 v1703 Build 15063.850

    Cumulative Update KB4056891 Windows 10 v1703 Build 15063.850

    Last Updated: 04 Jan 2018 at 09:18

    January 3, 2018 - KB4056891 (OS Build 15063.850)

    Improvements and fixes

    This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

    • Security updates to Internet Explorer, Microsoft Scripting Engine, Microsoft Edge, Windows Graphics, Windows Kernel, Windows Subsystem for Linux, and the Windows SMB Server.

    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, see the Security Update Guide.

    Known issues in this update

    Symptom Workaround
    When calling CoInitializeSecurity, the call will fail if passing RPC_C_IMP_LEVEL_NONE under certain conditions. Microsoft is working on a resolution and will provide an update in an upcoming release.
    Due to an issue with some versions of Anti-Virus software, this fix is only being made applicable to the machines where the Anti virus ISV has updated the ALLOW REGKEY. Contact your Anti-Virus AV to confirm that their software is compatible and have set the following REGKEY on the machine
    Value Name="cadca5fe-87d3-4b96-b7fb-a231484277cc"

    How to get this update

    This update will be downloaded and installed automatically from Windows Update. To get the standalone package for this update, go to the Microsoft Update Catalog website.


    Direct download links for KB4056891 from Microsoft Update Catalog:

    Download KB4056891 MSU for Windows 10 Version 1703 32-bit (x86) - 594.1 MB

    Download KB4056891 MSU for Windows 10 Version 1703 64-bit (x64) - 1025.8 MB
    Brink's Avatar Posted By: Brink
    03 Jan 2018

  1. Posts : 152
    Windows 10 Pro/Education x64

    The catalog links for the 64 bit version is messed up. This is the correct link.
      My Computer

  2. Posts : 343
    Windows 10 x64 Pro 21H2

    Hmmm... antivirus issues!
    I think I will pass from this update, for the very first time, I don't want to get random BSODs again...
      My Computers


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