Description of the security update for SharePoint Enterprise Server 2016: May 11, 2021 (KB5001917)

Summary

This security update resolves a Microsoft Word remote code execution vulnerability and SharePoint Denial of Service Update. To learn more about the vulnerabilities, see the following security advisories:

• Microsoft Common Vulnerabilities and Exposures CVE-2021-26418

• Microsoft Common Vulnerabilities and Exposures CVE-2021-28474

• Microsoft Common Vulnerabilities and Exposures CVE-2021-28478

• Microsoft Common Vulnerabilities and Exposures CVE-2021-31171

• Microsoft Common Vulnerabilities and Exposures CVE-2021-31172

• Microsoft Common Vulnerabilities and Exposures CVE-2021-31173

• Microsoft Common Vulnerabilities and Exposures CVE-2021-31181

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 update contains a fix for the following nonsecurity issue in SharePoint Server 2016:

• Fixes an issue in which SharePoint Designer doesn't work well on the site that disables the Wiki Home Page feature.

This update also contains a fix for the following nonsecurity issue in Project Server 2016:

• The Export to Excel function doesn't work for the Capacity and Engagements Heatmap view on the Capacity Planning page.

How to get and install the update

More information

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security