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Description of the security update for SharePoint Server 2016: December 9, 2025 (KB5002821)
Applies To
SharePoint Server 2016
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 Outlook Remote Code Execution vulnerability and Microsoft Word Remote Code Execution vulnerability. To learn more about the vulnerabilities, see the following security advisories:
Microsoft Common Vulnerabilities and Exposures CVE-2025-62562
Microsoft Common Vulnerabilities and Exposures CVE-2025-62559
Microsoft Common Vulnerabilities and Exposures CVE-2025-62558
Microsoft Common Vulnerabilities and Exposures CVE-2025-62555
Notes:
This is build 16.0.5530.1000 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:
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)
This security update contains improvements and fixes for the following nonsecurity issue in SharePoint Server 2016:
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.
To get the standalone package for this update, go to the Microsoft Update Catalog website.
You can get the standalone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.
16.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.100016.0.5530.1000