For more details check this article: Trending Issue: SharePoint fixes fail to install after installation of September 2025 CU
The product group released the December 2025 Cumulative Update for SharePoint Server 2019 product family. SharePoint Server 2019 is patched with a language dependent and a language independent fix.
The KB article for December 2025 CU will be available at the following Location in a couple of hours:
- KB 5002816 – December 2025 Update for SharePoint Server 2019 (language independent)
This is also a security update! - KB 5002802 – December 2025 Update for SharePoint Server 2019 (language dependent)
This is also a security update!
The downloads for December 2025 CU are available through the following links:
- Download December 2025 Update for SharePoint Server 2019 (language independent)
This is also a security update! - Download December 2025 Update for SharePoint Server 2019 (language dependent)
This is also a security update!
Important: It is required to install both fixes (language dependent and independent) to fully patch a SharePoint server. This applies also to servers which do not have language packs installed. The reason is that each SharePoint installation includes a language dependent component together with a language independent component. If additional language packs are added later (only) the language dependent fix has to be applied again.
It is irrelevant which language you pick on the drop down in download center. Even the language dependent fixes are all in the same package for all languages.
After installing the fixes you need to run the SharePoint 2019 Products Configuration Wizard on each machine in the farm. If you prefer to run the command line version psconfig.exe ensure to have a look here for the correct options.
Please ensure to have a look at the SharePoint Patching Best Practices before applying new fixes.
SharePoint 2019 December 2025 CU Build Number:
Language independent fix: 16.0.10417.20075
Language dependent fix: 16.0.10417.20075
Related Links:
- Technet: Updated Product Servicing Policy for SharePoint Server 2019
- Blog: SharePoint Patching Best Practices
- Blog: SharePoint Patching demystified
- Blog: Why I prefer PSCONFIGUI.EXE over PSCONFIG.EXE
- Technet: Update Center for Microsoft Office, Office Servers, and Related Products
- Blog: SharePoint Server 2016 Zero-Downtime Patching Demystified (applies also to SharePoint Server 2019)
- Blog: SharePoint does not have a build version. Full Stop.
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Hi Stefan,
Our SP Server 2019 farm is currently at August 2025 level. Can I just install the December 2025 patches and is there any additional actions I have to take?
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Hi Phu,
this should work without issues. My customers farm was on July and I patched it today with October CU.
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Thanks Sven. And I will need to use a non-farm account to run the Configuration Wizard, correct?
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Hi Stefan,
In each of the MS Descriptions of KB 5002816 & KB 5002802 it says to run the PS command to enable Classic WFM again after the patch:
“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
”
Is this necessary to run every time we install a patch?
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Hi Daniel,
no – this only has to be enabled once.
Cheers,
Stefan