Description of the security update for SharePoint Server 2016: July 14, 2026 (KB5002891)

Applies To
SharePoint Server 2016

Summary

Important

  • If you're currently running SharePoint Workflow Manager, you must install the SharePoint Workflow Manager (KB5002799) to your farm before you install this cumulative update.
  • If you're currently running the Classic version of Workflow Manager, you have to enable the debug flag in order to continue using Workflow Manager:
      $farm = Get-SPFarm
      $farm.ServerDebugFlags.Add(53601)
      $farm.update()
      iisreset

This security update resolves a Microsoft SharePoint Server Elevation of Privilege vulnerability, Microsoft Office Information Disclosure vulnerability, Microsoft SharePoint Server Spoofing vulnerability, and Microsoft SharePoint Remote Code Execution vulnerability. To learn more about the vulnerabilities, see the following security advisories:

Note

  • This is build 16.0.5561.1001 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: n

Improvements and fixes

This security update contains improvements and fixes for the following nonsecurity issues in SharePoint Server 2016:

  • This update resolves an issue in which SharePoint 2010 workflows don't initiate after the June 2026 update is installed.

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 Deployments - Security Update Guide.

Security update replacement information

This security update replaces previously released security update 5002880.

File hash information

File name SHA256 hash
sts2016-kb5002891-fullfile-x64-glb.exe 4945A33BB7359707D8E0894C85487EB5EC6D01F2C80948CF0270D6144DFDD9C0

File information

Download the list of files that are included in security update 5002891

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security