Updates for SharePoint Server Subscription Edition (December 2025 CU)

14 December 2025    |    Comments   Comments: 0

A new cumulative update (December 2025 CU) has been released for SharePoint Server Subscription Edition.

SP Build:
16.0.19127.20378

Important before installation:

If you are upgrading from the September 2025 CU to a newer update, remove the NT AUTHORITY\SYSTEM account from the local WSS_WPG and IIS_IUSRS groups on every SharePoint server in the farm before installation, if it is a member. Otherwise, installation of the update may fail.

Starting with the March 2023 CU, updates for SharePoint Server Subscription Edition are released as a single package (known as an Uber package) containing both language-independent and language-dependent fixes. Only one package needs to be installed to fully update the server.

SharePoint Subscription Edition CU – KB articles describing the CU:

  • KB 5002815 – December 2025 Update for SharePoint Server Subscription Edition

SharePoint Server Subscription Edition CU – CU download links:

After installation, remember to run the SharePoint Products Configuration Wizard or the following command:

PSConfig.exe -cmd upgrade -inplace b2b -wait -cmd applicationcontent -install -cmd installfeatures -cmd secureresources -cmd services -install

Important notes

To speed up CU installation, I recommend following the guidance in How to speed up CU installation in SharePoint Server Subscription Edition.

The language you select when downloading the update does not matter because the same package is downloaded for every language.

Note for this CU:

KB 5002815: Install this CU on the release version of SharePoint Server Subscription Edition. If the farm uses SharePoint Workflow Manager, first install KB5002799.

Classic Workflow Manager requires enabling the following debug flag to remain usable:

$farm = Get-SPFarm
$farm.ServerDebugFlags.Add(53601)
$farm.update()
iisreset

Included fixes and improvements

The following overview summarizes the fixes and improvements in this CU based on the official Microsoft KB articles.

SharePoint Server Subscription Edition

KB 5002815 addresses the SharePoint Server spoofing vulnerability CVE-2025-64672.

The unified package KB 5002815 brings these SharePoint Server Subscription Edition changes:

  • Adds the Version 25H2 feature update, which is also included in subsequent public updates.

  • Fixes an issue where keyboard navigation with TAB focuses the command bar’s New button twice.

  • Fixes an issue where text in the Image Upload options panel has an accessibility problem with its color contrast ratio.

  • Fixes an issue where activating the Send button leaves the focus sequence incorrect.

  • Fixes an issue where keyboard navigation with TAB cannot reach the Remove icon.

  • Fixes an issue where website crawling behaves incorrectly when the starting page links to content in higher-level directories.

  • Fixes an issue where ServiceHost errors suspend workflows and leave them unresponsive.

  • Requires selection of the library that will hold audit logs before the process starts.

  • Fixes an issue where data ingestion for hybrid search has reliability problems.

  • Fixes an issue where recent People Picker changes reduced performance, by reverting those changes.

  • Fixes an issue where characters from the GB18030 set render incorrectly.

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