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This security update resolves Microsoft SharePoint Server spoofing vulnerabilities. To learn more about the vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2021-38651 and Microsoft Common Vulnerabilities and Exposures CVE-2021-38652.

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 and improvements for the following nonsecurity issues in SharePoint Server 2016:

  • Fixes an issue in which the Appinv.aspx page can‘t be displayed in an iFrame. After you apply this update, you can follow the steps that are provided in KB 5005546 to add the trusted domains to the AllowIframeAppAuthorizePageDomains in the farm to be able to display the Appinv.aspx page in an iFrame.

  • Fixes the Workflow Auto Cleanup timer job execution issue that causes significant blocking in the database. This issue causes the sites that are listed in that database to become unavailable.

  • Enables you to create a subsite that has broken inheritance in a specific Active Directory or People Picker configuration. After you apply this update, you can follow the steps that are provided in KB 5005835 to set the property of WebApplication.

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 14, 2021 (KB5005848).

Security update replacement information

This security update replaces previously released security update 5002002.

File hash information

File name

SHA256 hash



File information

Download the list of files that are included in security update 5002020.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security

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