This security update resolves a Microsoft SharePoint Spoofing Vulnerability, SharePoint Remote Code Execution Vulnerability, and SharePoint Information Disclosure Vulnerability. To learn more about these vulnerabilities, 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 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 fixes for the following nonsecurity issues in SharePoint Server 2016:

  • While you browse Web Apps and Site Collections of unattached content databases by using the Backup and Restore feature in Central Administrator, selecting any Host Header Site Collection that includes port numbers would generate a blank screen.

  • Fixes RSS Viewer Web Part broken issues.

  • Fixes an issue in which the document URL in the callout ellipse in a document library is incorrectly displayed in a host-named site collection.

  • Fixes an issue in which a user's information in a database is replaced by another user who has the same tp_Id in another database.

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

  • No error message prompt is seen when a duplicated view is created in Project Web App.

  • The start/finish date for a task is wrong after the task's assignment work is increased to > 0 and where the task is a milestone (duration is 0). This problem occurs after you install KB 4486753.

Known issues in this update

  • Issue 1

    If your customized SharePoint pages use the SPWorkflowDataSource or FabricWorkflowInstanceProvider user control, some functions on those pages may not work.


    To resolve this issue, see KB5000640.

  • Issue 2

    The document URL in the callout ellipse in a document library is missing the DocID query string parameter if the Document ID feature is enabled.


    To resolve this issue, install KB 4493232.

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: February 9, 2021.

Security update replacement information

This security update replaces previously released security update 4493163.

File hash information

File name

SHA1 hash

SHA256 hash




File information

Download the list of files that are included in security update 4493195.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security

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