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This security update resolves a remote code execution vulnerability that exists in Microsoft SharePoint if the software does not check the source markup of an application package. To learn more about this vulnerability, see the following security advisories: 

Note To apply this security update, you must have the release version of Microsoft SharePoint Enterprise Server 2016 installed on the computer.

This public update delivers Feature Pack 2 for SharePoint Server 2016. Feature Pack 2 contains the following feature:

  • SharePoint Framework (SPFx)

This public update also delivers all the features that were included in Feature Pack 1 for SharePoint Server 2016, including:

  • Administrative Actions Logging

  • MinRole enhancements

  • SharePoint Custom Tiles

  • Hybrid Auditing (preview)

  • Hybrid Taxonomy

  • OneDrive API for SharePoint on-premises

  • OneDrive for Business modern user experience (available to Software Assurance customers)

The OneDrive for Business modern user experience requires an active Software Assurance contract at the time that the experience is enabled, either by installation of the public update or by manual enablement. If you don't have an active Software Assurance contract at the time of enablement, you must turn off the OneDrive for Business modern user experience.

For more information, see the following Microsoft Docs articles:

Improvements and fixes

This security update contains the following improvements in SharePoint Enterprise Server 2016:

  • Uninstalling an app when the second stage recycle bin is cleared now occurs only if no instances of the app currently exist.

  • With this update, in-place searches will now look for only results within the currently viewed folder. This greatly improves the search experience within a folder in large libraries that have files that spread across multiple folders.

This security update contains fixes for the following nonsecurity issues in SharePoint Enterprise Server 2016:

  • When you attach a content database from a previous version of SharePoint Server to SharePoint Server 2016, any existing "Table of Contents" web parts in that database always have the "Show content from starting location" setting enabled after the upgrade. This update fixes this issue by preserving the original setting during the upgrade.

  • You randomly receive a FedAuth cookie even though you have enabled Windows Authentication as the only authentication provider on your web application.

    Note To fix this issue completely, you must install KB 4475594together with this update.

This security update contains improvements and fixes for the following nonsecurity issues in Project Server 2016:

  • Users can now add tasks while editing a project in the Schedule view when the Project Summary Task option is selected. 

  • You can now receive information about any type kind of completed queue jobs for a project when you use the new GetAll() method from a REST call.

  • When the Schedule Variance Percentage (SVP) earned value becomes very large, it causes an overflow condition that prevents Project Web App (PWA) project views from loading. The SVP value now has a lower limit of -100% and upper limit of 100%.

How to get and install the update

Method 1: Microsoft Update

This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

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

Method 3: Microsoft Download Center

You can get the standalone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.

More information

Security update deployment information

For deployment information about this update, see security update deployment information: September 10, 2019.

Security update replacement information

This security update replaces previously released security update 4475549.

File hash information

File name

SHA1 hash

SHA256 hash




File information

Download the list of files that are included in security update 4475590.

How to get help and support for this security update

Help for installing updates: Protect yourself online

Help for protecting your Windows-based computer from viruses and malware: Microsoft Security

Local support according to your country: International Support

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