CVE-2026-21255

Summary

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

Affected Software

VendorProductVersion RangeStatus
MicrosoftWindows 10 Version 160710.0.14393.0 < 10.0.14393.8868affected
MicrosoftWindows 10 Version 180910.0.17763.0 < 10.0.17763.8389affected
MicrosoftWindows 10 Version 21H210.0.19044.0 < 10.0.19044.6937affected
MicrosoftWindows 10 Version 22H210.0.19045.0 < 10.0.19045.6937affected
MicrosoftWindows 11 version 22H310.0.22631.0 < 10.0.22631.6649affected
MicrosoftWindows 11 Version 23H210.0.22631.0 < 10.0.22631.6649affected
MicrosoftWindows 11 Version 24H210.0.26100.0 < 10.0.26100.7840affected
MicrosoftWindows 11 Version 25H210.0.26200.0 < 10.0.26200.7840affected
MicrosoftWindows 11 version 26H110.0.28000.0 < 10.0.28000.1575affected
MicrosoftWindows 11 Version 26H110.0.28000.0 < 10.0.28000.1575affected
MicrosoftWindows Server 201610.0.14393.0 < 10.0.14393.8868affected
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 < 10.0.14393.8868affected
MicrosoftWindows Server 201910.0.17763.0 < 10.0.17763.8389affected
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 < 10.0.17763.8389affected
MicrosoftWindows Server 202210.0.20348.0 < 10.0.20348.4773affected
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0 < 10.0.25398.2149affected
MicrosoftWindows Server 202510.0.26100.0 < 10.0.26100.32370affected
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 < 10.0.26100.32370affected

Weaknesses

  • CWE-284: CWE-284: Improper Access Control

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References