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
SharePoint Custom Tiles
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
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.
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.
Microsoft is investigating this issue and will post more information in this article when a fix becomes available.
To work around this issue, see KB 5000957.
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.
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
Information about protection and security
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