What is CVE-2026-40402?

CVE-2026-40402 is a security advisory published by Microsoft Security Response Center (MSRC) with Elevation of Privilege severity. Windows Hyper-V Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-40402 cover?

CVE-2026-40402 covers the following CVE IDs: CVE-2026-40402. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-40402?

CVE-2026-40402 has a CVSS v3 base score of 9.3, published by Microsoft Security Response Center (MSRC).

CVE-2026-40402Elevation of PrivilegeCVSS 9.3

Windows Hyper-V Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 22, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-40402 →

📋 Description

<p>Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.</p>