CVE-2026-21255

CWE-284 — Improper Access Control5 documents5 sources
Severity
8.8HIGH
EPSS
0.0%
top 91.27%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
24
Microsoft Windows 10 Version 1607Microsoft Windows 10 Version 1809Microsoft Windows 10 Version 21h2+21 more
Timeline
PublishedFeb 10

Description

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

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HExploitability: 2.0 | Impact: 6.0

Affected Packages24 packages

▶NVDmicrosoft/windows< 10.0.14393.8868+4
▶NVDmicrosoft/windows_10_1607< 10.0.14393.8868
▶NVDmicrosoft/windows_10_1809< 10.0.17763.8389
▶NVDmicrosoft/windows_10_21h2< 10.0.19044.6937
▶NVDmicrosoft/windows_10_22h2< 10.0.19045.6937

🔴Vulnerability Details

2
GHSA
GHSA-r2rm-869g-w2g5: Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally↗2026-02-10
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CVEList
Windows Hyper-V Security Feature Bypass Vulnerability↗2026-02-10
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📋Vendor Advisories

1
Microsoft
Windows Hyper-V Security Feature Bypass Vulnerability↗2026-02-10
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-21255 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-21255 (HIGH CVSS 8.8) | Improper access control in Windows | cvebase.io