CVE-2026-83728 Windows Hyper-V - Spoofing

Windows Hyper-V contains a spoofing vulnerability caused by improper validation of syntactic correctness of input, letting authorized attackers perform local spoofing, exploit requires attacker to be authorized.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Spoofing
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-1286

Vendor fix

Update to the latest version of Windows Hyper-V.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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