---
id: CVE-2026-6485
title: >-
  UEFI BIOS embedded Shell could be used to bypass Secure Boot via shell
  commands or startup scripts.
summary: >-
  UEFI BIOS embedded Shell could be used to bypass Secure Boot via shell
  commands or startup scripts.
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-489
vendor: Insyde Software
product: InsydeH2O
affected:
  - InsydeH2O See in the Solution
published: '2026-09-09'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T15:17:39.427'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-6485'
references:
  - url: 'https://www.insyde.com/security-pledge/sa-2026004/'
    label: 8338d8cb-57f7-4252-abc0-96fd13e98d21
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T14:30:08.094399Z'
epss: 0.00122
epssPercentile: 0.02265
ingestedAt: '2026-09-09T03:58:58.110Z'
---

## Overview

UEFI BIOS embedded Shell could be used to bypass Secure Boot via shell commands or startup scripts.

## Remediation

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