CVE-2026-21255

HIGH

8.8

Description

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

CVE Details

CVSS v3.1 Score8.8

SeverityHIGH

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/10/2026

Last Modified2/11/2026

Sourcenvd

Honeypot Sightings0

Affected Products

microsoft:windows_10_1607microsoft:windows_10_1809microsoft:windows_10_21h2microsoft:windows_10_22h2microsoft:windows_11_23h2microsoft:windows_11_24h2microsoft:windows_11_25h2microsoft:windows_server_2016microsoft:windows_server_2019microsoft:windows_server_2022microsoft:windows_server_2022_23h2microsoft:windows_server_2025

Weaknesses (CWE)

CWE-284

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21255(secure@microsoft.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.