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CVE-2026-21255highCWE-284

Windows Hyper-V Security Feature Bypass Vulnerability

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.8epss 0.4%
exploitation probability
0.4%top 69% of all CVEs
observed exploitation
nono source reports it
Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.
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