KB5002833: Fixes an issue that blocks zero downtime updating.
SharePoint Server Subscription Edition (SE)Microsoft
Description of the security update for SharePoint Server Subscription Edition: February 10, 2026 (KB5002833)
This security update resolves a Microsoft Word spoofing vulnerability and Microsoft Outlook spoofing vulnerability. To learn more about the vulnerabilities, see the following security advisories:
- Microsoft Common Vulnerabilities and Exposures CVE-2026-21511
- Microsoft Common Vulnerabilities and Exposures CVE-2026-21260
Improvements and fixesBOLD
This security update introduces the SharePoint Server Subscription Edition Version 25H2 feature update. This feature update will be included in all SharePoint Server Subscription Edition public updates going forward. For more information about this feature update, see New and improved features in SharePoint Server Subscription Edition Version 25H2.
This security update contains improvements and fixes for the following nonsecurity issues in SharePoint Server Subscription Edition:
- Restricts the People Picker to authorized users by excluding the "Everyone" claim through configurable access control settings. For example:
- $webApp.PeoplePickerSettings.ExcludeEveryoneClaim = $true
- The default setting is False.
- Fixes an issue that blocks zero downtime updating.
- Fixes an issue in which the SharePoint worker processes fail and return error 0xC0000409 on sites that have Calendar lists.
- Fixes an accessibility issue in which the discernible text isn't available for checkbox and expandable controls under the Site pages heading.
- Fixes an issue in which the SharePoint 2010 style workflow doesn't run in the SharePoint Timer Service.
- Fixes the repeated failures of w3wp process that are caused by missing Dynamic Link Libraries (DLL).
- Fixes an issue in which the "Timer Service Recycle" job is nonfunctional due to dependency on the removed STSADM.EXE.
- Fixes an issue in which the PDF upload in SharePoint Server Subscription Edition (SPSE) causes the w3wp process to stop responding.
- Fixes an issue in which certain SharePoint pages fail to render.
