What is CVE-2026-80083?

CVE-2026-80083 is a high-severity vulnerability in Microsoft Windows 11 Version 23h2, classified under Untrusted Pointer Dereference. CVSS score: 8.8/10. Published 2026-09-08.

How severe is CVE-2026-80083?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Microsoft Windows 11 Version 23h2

CVE-2026-80083

Untrusted pointer dereference in Windows Hyper-V allows an authorized attacker to execute code locally.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Microsoft Windows 11 Version 23h2
Microsoft Windows 11 Version 24h2
Microsoft Windows 11 Version 25h2
Microsoft Windows 11 Version 26h1
Microsoft Windows Server 2022
Microsoft Windows Server 2025
Microsoft Windows Server 2025 (Server Core Installation)

Weakness classification (CWE)

CWE-822 — Untrusted Pointer Dereference

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-80083?: CVE-2026-80083 is a high-severity vulnerability in Microsoft Windows 11 Version 23h2, classified under Untrusted Pointer Dereference. CVSS score: 8.8/10. Published 2026-09-08.
How severe is CVE-2026-80083?: High severity. CVSS v3 base score is 8.8 out of 10.