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Microsoft May 2026 Patch Tuesday, (Tue, May 12th)

Microsoft May 2026 Patch Tuesday, (Tue, May 12th)

Isc.Sans.Edu May 12, 2026

Today's Microsoft patch Tuesday fixes 137 different vulnerabilities. In addition, the update addresses 137 Chromium-related issues affecting Microsoft Edge.

There are no already disclosed or already exploited vulnerabilities included in today's patches. I removed the Chromium issues from the table below and included only the 137 Microsoft issues to make it more readable.

Note that issues related to Microsoft Azure are labeled as "no customer action required.

Significant Vulnerabilities of interest:

CVE-2026-41103: This vulnerability affects the Microsoft SSO Plugin for Jira & Confluence. Exploitation could lead to an elevation of privileges. With ongoing supply chain attacks, development and CI/CD tools like Jira and Confluence are popular targets.

CVE-2026-41089: A preauthentication remote code execution vulnerability in the Netlogon service will always be a juicy target, worth some AI tokens to write an exploit for.

Other critical vulnerabilities include the usual Word and Microsoft Office issues.

-- Johannes B. Ullrich, Ph.D. , Dean of Research, SANS.edu Twitter |