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CVE-2026-83728

Windows Hyper-V Spoofing Vulnerability

No known exploitation. No EPSS score yet. Fixed versions are out.

CVSS 3.18.8HighEPSS percentile—No score yetCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix5 products10 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • Microsoft Windows 10 Version 1607Affected: ≥ 10.0.14393.0, < 10.0.14393.9612Upgrade to: 10.0.14393.9612Affected: ≥ 10.0.17763.0, < 10.0.17763.9376Upgrade to: 10.0.17763.9376Affected: ≥ 10.0.19044.0, < 10.0.19044.7807Upgrade to: 10.0.19044.7807Affected: ≥ 10.0.19045.0, < 10.0.19044.7807Upgrade to: 10.0.19044.7807Stated by: CVE record
  • Microsoft Windows 11 version 23H2Affected: ≥ 10.0.22631.0, < 10.0.22631.7652Upgrade to: 10.0.22631.7652Affected: ≥ 10.0.26100.0, < 10.0.26100.9711Upgrade to: 10.0.26100.9711Affected: ≥ 10.0.26200.0, < 10.0.26200.9711Upgrade to: 10.0.26200.9711Affected: ≥ 10.0.28000.0, < 10.0.28000.3231Upgrade to: 10.0.28000.3231Stated by: CVE record
  • Microsoft Windows 11 Version 26H2Affected: ≥ 10.0.26300.0, < 10.0.26300.9711Upgrade to: 10.0.26300.9711Stated by: CVE record
  • Microsoft Windows Server 2012Affected: ≥ 6.2.9200.0, < 6.2.9200.26434Upgrade to: 6.2.9200.26434Stated by: CVE record
  • Microsoft Windows Server 2012 R2Affected: ≥ 6.3.9600.0, < 6.3.9600.23470Upgrade to: 6.3.9600.23470Stated by: CVE record

Versions as the sources state them. 4 more products have version data. Full version matrix after sign-in

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What it is

From the CVE record

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

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

No EPSS score yet. New CVEs are usually scored within a few days.

Lifecycle

4 events over 0 days, from the signal feeds we watch.

  1. Publishedweakness classified, record updated, record updated

Affected products

And 13 more affected products. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 8.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope ChangedThe exploit can affect other components (e.g. sandbox escape, host compromise from VM)

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

Sources

References in the record

In the news

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We'll flag the next CVE, public exploit or patch for Windows 10 Version 1607, not every advisory.