Summary
Impact: Spoofing. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An authenticated attacker running code in a Hyper-V guest could send a specially crafted network packet through the Hyper-V Virtual Switch. Successful exploitation could allow the attacker to bypass MAC-address spoofing protections and impersonate another network endpoint, which could enable interception, modification, or disruption of network traffic. User interaction is not required.
Security updates
10.0.26300.9711 — https://support.microsoft.com/help/5127648
10.0.17763.9376 — https://support.microsoft.com/help/5126651
10.0.20348.5761 — https://support.microsoft.com/help/5126655
10.0.19044.7807 — https://support.microsoft.com/help/5126657
10.0.26100.33650 — https://support.microsoft.com/help/5126646
10.0.22631.7652 — https://support.microsoft.com/help/5126653
10.0.28000.3231 — https://support.microsoft.com/help/5127646
10.0.14393.9612 — https://support.microsoft.com/help/5126868
6.2.9200.26434 — https://support.microsoft.com/help/5126835
6.3.9600.23470 — https://support.microsoft.com/help/5126836
Vulnerabilities 1
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High 8.8
Windows Hyper-V Spoofing Vulnerability
Improper validation of syntactic correctness of input in Windows Hyper-V allows an authorized attacker to perform spoofing locally.
Revision history
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#1
Information published.
References
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CVE-2026-83728 Windows Hyper-V Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83728
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss