Description of the security update for SharePoint Enterprise Server 2016: September 14, 2021 (KB5002020)

Summary

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:
• New features included in the November 2016 Public Update for SharePoint Server 2016 (Feature Pack 1)
• New features included in the September 2017 Public Update for SharePoint Server 2016 (Feature Pack 2)

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 AllowIframeAppAuthorizePageDomainsin 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.

• Download security update 5002020 for the 64-bit version of SharePoint Enterprise Server 2016

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
sts2016-kb5002020-fullfile-x64-glb.exe	1D013B514542038851B08CCEF03FEB89F76FCF25ECD08893B77603F15F44E4CE

File information

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

Information about protection and security

Protect yourself online: Windows Security supportLearn how we guard against cyber threats: Microsoft Security