---
id: CVE-2026-83728
title: >-
  Improper validation of syntactic correctness of input in Windows Hyper-V
  allows an authorized attacker to perform spoofing locally.
summary: >-
  Improper validation of syntactic correctness of input in Windows Hyper-V
  allows an authorized attacker to perform spoofing locally.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-1286
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T23:18:23.617'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83728'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83728'
    label: secure@microsoft.com
tags:
  - nvd
ingestedAt: '2026-10-13T19:43:29.096Z'
---

## Overview

Improper validation of syntactic correctness of input in Windows Hyper-V allows an authorized attacker to perform spoofing locally.

## Remediation

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