CVE-2026-84011

Published: Oct 13, 2026Modified: Oct 19, 2026

5.5

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Exploitability: 1.8 / Impact: 3.6

Source: secure@microsoft.com (Secondary)

Description

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

Affected (12)

Products: Microsoft: Windows 11 23h2, Windows 11 24h2, Windows 11 25h2, Windows 11 26h1, Windows 11 26h2, Windows Server 2022, Windows Server 2025

7 products

Windows 11 23h2

Windows 11 24h2

Windows 11 25h2

Windows 11 26h1

Windows 11 26h2

Windows Server 2022

Windows Server 2025

Configuration A

12 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 11 23h2	version < 10.0.22631.7652
Microsoft Windows 11 23h2	version < 10.0.22631.7652
Microsoft Windows 11 24h2	version < 10.0.26100.9711
Microsoft Windows 11 24h2	version < 10.0.26100.9711
Microsoft Windows 11 25h2	version < 10.0.26200.9711
Microsoft Windows 11 25h2	version < 10.0.26200.9711
Microsoft Windows 11 26h1	version < 10.0.28000.3231
Microsoft Windows 11 26h1	version < 10.0.28000.3231
Microsoft Windows 11 26h2	version < 10.0.26300.9711
Microsoft Windows 11 26h2	version < 10.0.26300.9711
Microsoft Windows Server 2022	version < 10.0.20348.5761
Microsoft Windows Server 2025	version < 10.0.26100.33650

Related CWEs

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84011

Source: secure@microsoft.com

Vendor AdvisoryPatch

Timeline

No history available yet.