Updates for SharePoint Server Subscription Edition (June 2026 CU)

14 June 2026    |    Comments   Comments: 0

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

SP Build:
16.0.19725.20384

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 5002873 – June 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 5002873: 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 5002873 addresses remote code execution and spoofing vulnerabilities in SharePoint Server. The KB lists: CVE-2026-45453, CVE-2026-48562, CVE-2026-47640, CVE-2026-48560, CVE-2026-47641, CVE-2026-45481, CVE-2026-47639, CVE-2026-47638, CVE-2026-47636, CVE-2026-47634, CVE-2026-47637, CVE-2026-47298, CVE-2026-45454, CVE-2026-45483, CVE-2026-45465, CVE-2026-45464, CVE-2026-45462, CVE-2026-44824, CVE-2026-33113, CVE-2026-45458, CVE-2026-45456, CVE-2026-44821, CVE-2026-44819, CVE-2026-45485, CVE-2026-45479, CVE-2026-45484, CVE-2026-45471, CVE-2026-45475, CVE-2026-45468, CVE-2026-45467, CVE-2026-58644.

The unified package KB 5002873 brings these SharePoint Server Subscription Edition changes:

  • Adds the Version 26H1 feature update, which is also included in subsequent public updates.

  • Fixes an issue where viewing and editing multi-value managed metadata fields in the document web part fails.

  • Fixes an issue where web parts on communication sites lose text data.

  • Improves focus handling with the Property Pane open: selecting the editor now returns focus to it.

  • Fixes an issue affecting GB18030-2022 certification.

  • Fixes an issue where search results display incorrect characters in the About Me section of user profiles.

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