CVE-2026-83766
Windows Hyper-V Security Feature Bypass Vulnerability
Incorrect authorization in Windows Hyper-V allows an authorized attacker to bypass a security feature over an adjacent network.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- High
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Windows Hyper-V Security Feature Bypass Vulnerability
Incorrect authorization in Windows Hyper-V allows an authorized attacker to bypass a security feature over an adjacent network.
- Record
CVE-2026-83766- CVSS 3.1
- 4.2 Medium
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 - Weakness
- CWE-863
- Updated
- 2026-11-10
EUVDEUVD-2026-99987
Incorrect authorization in Windows Hyper-V allows an authorized attacker to bypass a security feature over an adjacent network.
- Record
EUVD-2026-99987- CVSS 3.1
- 4.2 Medium
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 - Updated
- 2026-11-10
GitHub AdvisoriesGHSA-g44p-2wq5-xw65
Incorrect authorization in Windows Hyper-V allows an authorized attacker to bypass a security...
Incorrect authorization in Windows Hyper-V allows an authorized attacker to bypass a security feature over an adjacent network.
- Record
GHSA-g44p-2wq5-xw65- CVSS 3.1
- 4.2 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
NVD
Incorrect authorization in Windows Hyper-V allows an authorized attacker to bypass a security feature over an adjacent network.
- Record
CVE-2026-83766- CVSS 3.1
- 4.2 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
Affected products
- microsoft windows 10 version 1607
- microsoft windows 10 version 1809
- microsoft windows 10 version 21h2
- microsoft windows 10 version 22h2
- microsoft windows 11 version 23h2
- microsoft windows 11 version 24h2
- microsoft windows 11 version 25h2
- microsoft windows 11 version 26h1
- microsoft windows 11 version 26h2
- microsoft windows server 2016
- microsoft windows server 2016 (server core installation)
- microsoft windows server 2019
Show 13 moreShow less
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows server 2025
- microsoft windows server 2025 (server core installation)
- microsoft windows 10 1607
- microsoft windows 10 1809
- microsoft windows 10 21h2
- microsoft windows 10 22h2
- microsoft windows 11 23h2
- microsoft windows 11 24h2
- microsoft windows 11 25h2
- microsoft windows 11 26h1
- microsoft windows 11 26h2
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | CVE List | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-83766 is a medium vulnerability (CVSS 4.2) in Microsoft Windows 10 Version 1607, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. No source names a fixed version.