Fixes an issue in which the w3wp process stops responding repeatedly.

Description of the security update for SharePoint Server 2019 Language Pack: February 10, 2026 (KB5002836)

This security update resolves Microsoft Outlook spoofing vulnerability and Microsoft Word 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 fixes
This security update contains an improvement and a fix for the following nonsecurity issue in SharePoint Server 2019 Language Pack:

• Fixes an issue in which the w3wp process stops responding repeatedly.
• Fixes an issue in which Set-SPMachineKey can no longer be used to set machine keys after the September 2025 cumulative update is installed.