CVE-2026-83728

Improper validation of syntactic correctness of input in Windows Hyper-V allows an authorized…

Risk score: 56/100
CVSS: 8.8 v3.1
Exploit chance (30 days): 0.2%
Published: 13 Oct 2026

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What to know

What it is: Improper validation of syntactic correctness of input in Windows Hyper-V allows an authorized attacker to perform spoofing locally.
Affected: See advisory
Fix: Apply the vendor's security update; see the linked advisory.
Exploitation: No known exploitation

Why it is Yellow

CVSS 8.8 high

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83728

Original description

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

Last activity 13 Oct 2026. Patch Forecast updates every hour.