Vulnerability record/PUBLISHED/Published Oct 13, 2026 19:00:54 UTC

CVE-2026-83766

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

Base score4.2/ 10

SeverityMediumCVSS 3.1

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityMedium

Attack vectorAdjacentAV

Attack complexityHighAC

Privileges requiredHighPR

User interactionNoneUI

ScopeUnchangedS

Confidentiality impactNoneC

Integrity impactHighI

Availability impactNoneA

Exploit maturityUnprovenE

CVSS vector stringCVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering Authoritymicrosoft

Last updatedOct 25, 2026 18:45:35 UTC

PublishedOct 13, 2026 19:00:54 UTC

ReservedAug 31, 2026 22:57:35 UTC