CVE-2026-83766

medium

EUVD alias: EUVD-2026-99987

Assigned by CNA: microsoft

Published 2026-10-13 · Modified 2026-10-13

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CVSS v3

4.2

CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

CVSS v4 NEW

—

not yet in upstream

VIR risk

4.2

Description

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

Predictions

Exploit likelihood

42%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Windows Affected 1 release

Version	Package	Status	Fixed in
—	—	Affected	—

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83766

CWEs

CWE-863

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.