KB5002828: This update fixes the data duplication issue that occurs during the Remote Blob Storage (RBS) migration.

Description of the security update for SharePoint Server 2016: January 13, 2026 (KB5002828)

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 Microsoft Office Click-To-Run Elevation of Privilege vulnerability, Microsoft SharePoint Remote Code Execution vulnerability, Microsoft SharePoint Information Disclosure vulnerability, Microsoft Word Remote Code Execution vulnerability, Microsoft SharePoint Server Remote Code Execution vulnerability, and Microsoft SharePoint Server Spoofing vulnerability. To learn more about the vulnerabilities, see the following security advisories:

• Microsoft Common Vulnerabilities and Exposures CVE-2026-20943
• Microsoft Common Vulnerabilities and Exposures CVE-2026-20948
• Microsoft Common Vulnerabilities and Exposures CVE-2026-20963
• Microsoft Common Vulnerabilities and Exposures CVE-2026-20958
• Microsoft Common Vulnerabilities and Exposures CVE-2026-20951
• Microsoft Common Vulnerabilities and Exposures CVE-2026-20959
• Microsoft Common Vulnerabilities and Exposures CVE-2026-20947

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:

• New features included in the November 2016 Public Update for SharePoint Server 2016 (Feature Pack 1)
• New features included in the September 2017 Public Update for SharePoint Server 2016 (Feature Pack 2)

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

• This update fixes the data duplication issue that occurs during the Remote Blob Storage (RBS) migration.