CVE-2026-0390

Published: Apr 14, 2026Modified: Oct 25, 2026

6.7

Vector

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

Exploitability: 0.8 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Reliance on untrusted inputs in a security decision in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.

Affected (13)

Products: Microsoft: Windows 10 1607, Windows 10 1809, Windows 10 21h2, Windows 10 22h2, Windows Server 2016, Windows Server 2019, Windows Server 2022

7 products

Windows 10 1607

Windows 10 1809

Windows 10 21h2

Windows 10 22h2

Windows Server 2016

Windows Server 2019

Windows Server 2022

Configuration A

13 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1607	version < 10.0.14393.9060
Microsoft Windows 10 1607	version < 10.0.14393.9060
Microsoft Windows 10 1809	version < 10.0.17763.8644
Microsoft Windows 10 1809	version < 10.0.17763.8644
Microsoft Windows 10 21h2	version < 10.0.19044.7184
Microsoft Windows 10 21h2	version < 10.0.19044.7184
Microsoft Windows 10 21h2	version < 10.0.19044.7184
Microsoft Windows 10 22h2	version < 10.0.19045.7184
Microsoft Windows 10 22h2	version < 10.0.19045.7184
Microsoft Windows 10 22h2	version < 10.0.19045.7184
Microsoft Windows Server 2016	version < 10.0.14393.9060
Microsoft Windows Server 2019	version < 10.0.17763.8644
Microsoft Windows Server 2022	version < 10.0.20348.5020

Related CWEs

Reliance on Untrusted Inputs in a Security Decision

The product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-0390

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.