What is CVE-2026-84011?

CVE-2026-84011 is a medium-severity vulnerability in Microsoft Windows 11 Version 23h2, classified under Incorrect Authorization. CVSS score: 5.5/10. Published 2026-10-13.

How severe is CVE-2026-84011?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Auth bypass in Microsoft Windows 11 Version 23h2

CVE-2026-84011

Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.

Vulnerability class: Broken Access Control

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

Windows SMB Client Security Feature Bypass Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-84011?: CVE-2026-84011 is a medium-severity vulnerability in Microsoft Windows 11 Version 23h2, classified under Incorrect Authorization. CVSS score: 5.5/10. Published 2026-10-13.
How severe is CVE-2026-84011?: Medium severity. CVSS v3 base score is 5.5 out of 10.