CVE-2026-0390

Received Received - Intake

Security Bypass via Untrusted Input in Windows Boot Loader

Publication date: 2026-04-14

Last updated on: 2026-04-24

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-04-14

Last Modified

2026-04-24

Generated

2026-07-06

AI Q&A

2026-04-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-0390

EUVD

EUVD-2026-22350

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_10_1607	to 10.0.14393.9060 (exc)
microsoft	windows_10_1607	to 10.0.14393.9060 (exc)
microsoft	windows_10_1809	to 10.0.17763.8644 (exc)
microsoft	windows_10_1809	to 10.0.17763.8644 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7184 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7184 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7184 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7184 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7184 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7184 (exc)
microsoft	windows_server_2016	to 10.0.14393.9060 (exc)
microsoft	windows_server_2019	to 10.0.17763.8644 (exc)
microsoft	windows_server_2022	to 10.0.20348.5020 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-807	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.

Attack-Flow Graph

Executive Summary

This vulnerability involves the Windows Boot Loader relying on untrusted inputs when making a security decision. Because of this, an authorized attacker who has local access can bypass a security feature.

Compliance Impact

The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

Impact Analysis

The vulnerability allows an authorized local attacker to bypass a security feature in the Windows Boot Loader. This can lead to a compromise of confidentiality, integrity, and availability of the affected system.

Hi! I’m here to help you understand CVE-2026-0390. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70