May 2026: Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-40420 Published on May 12, 2026
Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
Improper access control in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2026-40420 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2026-40420
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Affected Versions
Microsoft 365 Apps for Enterprise:- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 19.0.0 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.0 and below https://aka.ms/OfficeSecurityReleases is affected.