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Microsoft CVE-2026-40420

| EUVD-2026-29677 HIGH
Improper Access Control (CWE-284)
2026-05-12 microsoft GHSA-q3w4-cjqg-q4x3
Authentication Bypass Microsoft
8.8
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
CVE Published
May 12, 2026 - 16:59 nvd
HIGH 8.8

DescriptionNVD

Improper access control in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.

Analysis

Improper access control in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.

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CVE-2026-40420 vulnerability details – vuln.today
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