Description of the security update for SharePoint Server 2016: September 09, 2025 (KB5002778)

Summary

This security update resolves a Microsoft SharePoint remote code execution vulnerability, Microsoft Word information disclosure vulnerability, and Microsoft Office remote code execution vulnerability. To learn more about the vulnerabilities, see the following security advisories:

Notes:

This is build 16.0.5517.1000 of the security update package.
To apply this security update, you must have the release version of Microsoft SharePoint 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 Learn articles:

Improvements and fixes

This security update contains improvements and fixes for the following nonsecurity issue in SharePoint Server 2016.

You can now use the Test-DefenderAndAmsiWorkProperly cmdlet in SharePoint Management Shell to verify that all Windows Defender components are installed and active, and that SharePoint AMSI (Antimalware Scan Interface) integration is functioning correctly.
In order to use workflows in SharePoint Server, you must now have the latest update for SharePoint Workflow Manager installed.
To strengthen security in SharePoint Server, users in the WSS_WPG group are now restricted from running administrative processes, such as the SharePoint Products Configuration Wizard (Psconfig). For more information, see Account permissions and security settings in SharePoint Servers.
Enables the automatic machine key rotation feature.
Enhances the AMSI Filter feature module. Changes the default setting to be always on.

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 for Microsoft SharePoint Server 2016 (KB5002778)

More information

Security update deployment information

For deployment information about this update, see Deployments - Security Update Guide.

Security update replacement information

This security update replaces previously released security update 5002771.

File hash information

File name	SHA256 hash
sts2016-kb5002778-fullfile-x64-glb.exe	18BB02BD044310E7929D85AB7FBE57D69E4622A9E782E334BF3EB81AD7A7BCDF

File information

Download the list of files that are included in security update 5002778.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security