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CVE-2026-83766

Windows Hyper-V Security Feature Bypass Vulnerability

MEDIUM
4.2
CVSS Score
Published: October 13, 2026 at 07:00 PM UTC
Updated: October 31, 2026 at 06:09 PM UTC
14 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows 10 1809

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Severity
MEDIUM4.2
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Incorrect authorization in Windows Hyper-V allows an authorized attacker to bypass a security feature over an adjacent network.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83766

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.2MEDIUMmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-863

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