CVE-2026-24294

Published: Mar 10, 2026Modified: Mar 27, 2026

7.8

Vector

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

Exploitability: 1.8 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.

Affected (25)

Products: Microsoft: Windows 10 1607, Windows 10 1809, Windows 10 21h2, Windows 10 22h2, Windows 11 23h2, Windows 11 24h2, Windows 11 25h2, Windows 11 26h1, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2022 23h2, Windows Server 2025

14 products

Windows 10 1607

Windows 10 1809

Windows 10 21h2

Windows 10 22h2

Windows 11 23h2

Windows 11 24h2

Windows 11 25h2

Windows 11 26h1

Windows Server 2012

Windows Server 2016

Windows Server 2019

Windows Server 2022

Windows Server 2022 23h2

Windows Server 2025

Configuration A

25 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1607	Before 10.0.14393.8957
Microsoft Windows 10 1607	Before 10.0.14393.8957
Microsoft Windows 10 1809	Before 10.0.17763.8511
Microsoft Windows 10 1809	Before 10.0.17763.8511
Microsoft Windows 10 21h2	Before 10.0.19044.7058
Microsoft Windows 10 21h2	Before 10.0.19044.7058
Microsoft Windows 10 21h2	Before 10.0.19044.7058
Microsoft Windows 10 22h2	Before 10.0.19045.7058
Microsoft Windows 10 22h2	Before 10.0.19045.7058
Microsoft Windows 10 22h2	Before 10.0.19045.7058
Microsoft Windows 11 23h2	Before 10.0.22631.6783
Microsoft Windows 11 23h2	Before 10.0.22631.6783
Microsoft Windows 11 24h2	Before 10.0.26100.7979
Microsoft Windows 11 24h2	Before 10.0.26100.7979
Microsoft Windows 11 25h2	Before 10.0.26200.7979
Microsoft Windows 11 25h2	Before 10.0.26200.7979
Microsoft Windows 11 26h1	Before 10.0.28000.1719
Microsoft Windows 11 26h1	Before 10.0.28000.1719
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2
Microsoft Windows Server 2016	Before 10.0.14393.8957
Microsoft Windows Server 2019	Before 10.0.17763.8511
Microsoft Windows Server 2022	Before 10.0.20348.4830
Microsoft Windows Server 2022 23h2	Before 10.0.25398.2207
Microsoft Windows Server 2025	Before 10.0.26100.32463

Related CWEs

Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

References (3)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-24294

Source: secure@microsoft.com

Vendor Advisory

https://www.vicarius.io/vsociety/posts/cve-2026-24294-detection-script-improper-authentication-vulnerability-in-windows-smb-server

Source: af854a3a-2127-422b-91ae-364da2661108

https://www.vicarius.io/vsociety/posts/cve-2026-24294-mitigation-script-improper-authentication-vulnerability-in-windows-smb-server

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.