CVE-2026-21255 HIGH

CVE-2026-21255: Windows Hyper-V Security Feature Bypass Vulnerability

Vendor Microsoft
Product Windows 10 Version 1607
Weakness CWE-284
Published February 10, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.

Key dates

02Disclosure timeline

February 10, 2026 CVE published
May 11, 2026 Record updated