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We declare System.Web.UI.WebControls.PasswordRecovery to be an unsafe control because of security concerns. Therefore, we recommend that you no longer use it.


This security update resolves vulnerabilities in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. 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

  • 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 fixes an issue in SharePoint Server 2016 in which the CoauthoringVersionPeriod value is not regarded in a co-authoring session. After this update is installed, CoauthoringVersionPeriod is set to 30 minutes by default. A new version of the file won't be created automatically when a file opens in a co-authoring session. You can change the value of CoauthoringVersionPeriod per your version creation requirement.

This security update also fixes the following issues in Project Server 2016:

  • When timesheets are submitted, the "Reporting (Timesheet Save)" queue job is created. However, this job may run very slowly. This creates a backup of queue jobs and causes other slow performance problems.

  • Project Web App instances that have many timesheets or timesheet views may experience a time-out when you create timesheet views or modify existing timesheet views. This can prevent you from creating timesheets or opening existing timesheets.

Known issues in this update

An error may occur when you upload a file that's larger than 100 MB to a document library.

To solve this issue, install KB 4486753.

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: November 10, 2020.

Security update replacement information

This security update replaces previously released security update 4486677.

File hash information

File name

SHA1 hash

SHA256 hash




File information

Download the list of files that are included in security update 4486717.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security

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