MEDIUM Published October 13, 2026

CVE-2026-83766

Incorrect authorization in Windows Hyper-V allows an authorized attacker to bypass a security feature over an adjacent network.

CVSS base score

4.2 (v3.1)

Severity

MEDIUM

Attack vector

Adjacent_network

Weakness

CWE-863

Last modified

October 29, 2026

CVSS vector

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

Affected products

microsoft windows 10 1607 microsoft windows 10 1809 microsoft windows 10 21h2 microsoft windows 10 22h2 microsoft windows 11 23h2 microsoft windows 11 24h2 microsoft windows 11 25h2 microsoft windows 11 26h1 microsoft windows 11 26h2 microsoft windows server 2016

References

msrc.microsoft.com Patch, Vendor Advisory

View full NVD advisory →

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CVE-2026-83766

Affected products

References

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Published the same day

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