Vulnerability · Published Sep 9, 2026 · Assigned by Insyde
CVE-2026-6485UEFI BIOS embedded Shell can be used to bypass Secure Boot
High 8.2
In plain English
A high-severity security flaw in InsydeH2O from Insyde Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.2%top 92.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
UEFI BIOS embedded Shell could be used to bypass Secure Boot via shell commands or startup scripts.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Insyde Software | InsydeH2O | See in the Solution |
Weakness: CWE-489 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H