May 12, 2020—KB4556804 (OS Build 15063.2375)

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 to improve security when Windows performs basic operations.

• Updates for storing and managing files.

Improvements and fixes

This security update includes quality improvements. Key changes include:

• Addresses an issue that occurs when a third-party application loads hidden tabs into Internet Options.

• Addresses an issue that prevents certain apps from installing if they are published using a Group Policy Object.

• Addresses an issue that prevents Microsoft User Experience Virtualization (UE-V) settings from roaming to enable the signature files that are used for new messages, forwarded messages, and replies.

• Updates the 2020 start date for daylight saving time (DST) in the Kingdom of Morocco.

• Security updates to Internet Explorer, the Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Input and Composition, Windows Media, Windows Shell, Microsoft Edge, Windows Update Stack, Windows Fundamentals, Windows Cryptography, Windows Kernel, Windows Core Networking, Internet Information Services, Windows Network Security and Containers, Windows Active Directory, Windows Storage and Filesystems, and the Microsoft JET Database Engine.

 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

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 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 (KB4550992) 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

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4556804.