KB5002872: Security update for SharePoint Server 2019 Language Pack

Description of the security update for SharePoint Server 2019 Language Pack: May 12, 2026 (KB5002872)

Summary
Important:

• If you're running 2013-type workflows, you mustinstall the August 2025 update for SharePoint Workflow Manager​​​​​​​ to your farm before you install this cumulative update.
• If you're currently running the Classic version of Workflow Manager, you must enable the debug flag to continue using it.
  ​​​​​​​
  $farm = Get-SPFarm
  $farm.ServerDebugFlags.Add(53601)
  $farm.update()
  iisreset

This security update resolves Microsoft Word Remote Code Execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2026-​​​​40367.

Notes:

• This is build 16.0.10417.20128 of the security update package.
• To apply this security update, you must have the release version of Microsoft SharePoint Server 2019 installed on the computer.

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 decorative images lack alternative text or an appropriate role, causing screen readers to announce them as “graphic.” The update makes sure that decorative images are correctly marked so that they're ignored by assistive technologies, improving accessibility compliance.
• Fixes an issue in which the contrast between foreground and background colors doesn't meet WCAG 2.0 AA minimum contrast ratio thresholds. The update ensures compliance by adjusting color contrast to meet accessibility standards