Description of the security update for SharePoint Enterprise Server 2016: February 9, 2021 (KB4493195)

Summary

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:

• Microsoft Common Vulnerabilities and Exposures CVE-2021-1726

• Microsoft Common Vulnerabilities and Exposures CVE-2021-24071

• Microsoft Common Vulnerabilities and Exposures CVE-2021-24072

• Microsoft Common Vulnerabilities and Exposures CVE-2021-24066

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 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.

  Resolution

  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.

  Resolution

  To resolve this issue, install KB 4493232.

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