CVE-2026-102221

Undergoing Analysis Undergoing Analysis - In Progress

Secure Boot Bypass in Windows

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

No cwe for this issue in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-102221

EUVD

EUVD-2026-100369

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	10 Version 1607 10.0.14393.0
Microsoft	Windows	10 Version 1809 10.0.17763.0
Microsoft	Windows	10 Version 21H2 10.0.19044.0
Microsoft	Windows	10 Version 22H2 10.0.19045.0
Microsoft	Windows	11 version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 23H2 10.0.22631.0
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2016 10.0.14393.0
Microsoft	Windows	Server 2016 (Server Core installation) 10.0.14393.0
Microsoft	Windows	Server 2019 10.0.17763.0
Microsoft	Windows	Server 2019 (Server Core installation) 10.0.17763.0
Microsoft	Windows	Server 2022 10.0.20348.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-299	The product does not check or incorrectly checks the revocation status of a certificate, which may cause it to use a certificate that has been compromised.

Attack-Flow Graph

Executive Summary

This is a security feature bypass vulnerability in Windows Secure Boot. An authorized attacker with local access can exploit it to bypass a security feature, potentially allowing unauthorized actions on the system.

Impact Analysis

An attacker with local access could bypass security controls, potentially leading to unauthorized system modifications, data access, or installation of malicious software. This could compromise system integrity and confidentiality.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements for GDPR, HIPAA, and other regulations that mandate strict access controls and data protection.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft Update to patch the Secure Boot bypass vulnerability. Monitor Microsoft's advisory for additional guidance and ensure Secure Boot is enabled in BIOS/UEFI settings.

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