---
id: CVE-2026-45654
title: Secure Boot Security Feature Bypass Vulnerability
summary: >-
  Improper access control in Windows Secure Boot allows an authorized attacker
  to bypass a security feature locally.
severity: high
cvss: 7.9
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-284
vendor: Microsoft
product: Windows 11 Version 24H2
affected:
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8655
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8655
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2269
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32995
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.32995
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-10T03:55:26.597262Z'
published: '2026-06-09'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:44:35.848Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-45654'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45654'
    label: Secure Boot Security Feature Bypass Vulnerability
tags:
  - cve.org
epss: 0.00335
epssPercentile: 0.24054
ingestedAt: '2026-09-24T14:44:21.390Z'
---

## Overview

Improper access control in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.

## Affected

- `windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8655`
- `windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8655`
- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2269`
- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.32995`
- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.32995`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.