Updates for SharePoint Server Subscription Edition (March 2026 CU)

15 March 2026    |    Comments   Comments: 0

A new cumulative update (March 2026 CU) has been released for SharePoint Server Subscription Edition.

SP Build:
16.0.19725.20076

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 5002843 – March 2026 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 5002843: 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

A direct upgrade from January 2026 to March 2026 fails in the SharePoint Products Configuration Wizard (PSConfig). Use this sequence: KB5002822 (January) → KB5002833 (February) → KB5002843 (March). Run the wizard immediately after installing February and again after March so that all required schema upgrades are applied.

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 5002843 addresses remote code execution in Microsoft Office and SharePoint Server, and spoofing in SharePoint Server. Relevant advisories: CVE-2026-26113, CVE-2026-26106, CVE-2026-26105.

The unified package KB 5002843 brings these SharePoint Server Subscription Edition changes:

  • Fixes an issue where a Secure Store Target application reports “Group claim validation failed”.

  • Reduces duplicate Hybrid Search onboarding requests and sets a 15-minute retry interval after consecutive failures.

  • Changes the Hybrid Search onboarding script to use a customer-owned application.

  • Fixes an issue where the SharePoint Administration service cannot start on Windows Server 2025.

Comments are closed.