Description of the security update for SharePoint Server 2016: June 9, 2026 (KB5002880)

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 it: $farm = Get-SPFarm

$farm.ServerDebugFlags.Add(53601)

$farm.update()

iisreset

This security update resolves a Microsoft Word Remote Code Execution vulnerability, Microsoft Word Information Disclosure vulnerability, Microsoft SharePoint Server Spoofing Vulnerability. To learn more about the vulnerabilities, see the following security advisories:

Notes:

This is build 16.0.5556.1005 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 issues in SharePoint Server 2016:

This update fixes an issue in which pages don't load because certain user controls are flagged as unsafe for security. After this fix is applied, customers can explicitly trust the affected controls by configuring the custom farm property, (AllowedTagPrefixesWhichAreNotWebControlsList).

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 (KB5002880).

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 5002868.

File hash information

File name	SHA256 hash
sts2016-kb5002880-fullfile-x64-glb.exe	580F514A69C9DFA55884A5AD9CD28DA9CFBC59EE61C18595E26F5C0891C58C18

File information

Download the list of files that are included in security update 5002880.

Information about protection and security

Protect yourself online: Windows Security support

Learn how we guard against cyber threats: Microsoft Security