What is CVE-2026-83939?

CVE-2026-83939 is a high-severity vulnerability in Microsoft Windows 11 Version 26h1, classified under Untrusted Pointer Dereference. CVSS score: 8.2/10. Published 2026-09-08.

How severe is CVE-2026-83939?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Microsoft Windows 11 Version 26h1

CVE-2026-83939

Untrusted pointer dereference in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Microsoft Windows 11 Version 26h1

Weakness classification (CWE)

CWE-822 — Untrusted Pointer Dereference

References

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

Frequently asked questions

What is CVE-2026-83939?: CVE-2026-83939 is a high-severity vulnerability in Microsoft Windows 11 Version 26h1, classified under Untrusted Pointer Dereference. CVSS score: 8.2/10. Published 2026-09-08.
How severe is CVE-2026-83939?: High severity. CVSS v3 base score is 8.2 out of 10.