---
id: CVE-2026-83766
title: >-
  Incorrect authorization in Windows Hyper-V allows an authorized attacker to
  bypass a security feature over an adjacent network.
summary: >-
  Incorrect authorization in Windows Hyper-V allows an authorized attacker to
  bypass a security feature over an adjacent network.
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-863
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:18:47.773'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83766'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83766'
    label: secure@microsoft.com
tags:
  - nvd
ingestedAt: '2026-10-13T19:43:29.106Z'
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.