UEFI BIOS embedded Shell can be used to bypass Secure Boot

published 2026-09-09 2 mo ago modified 2026-09-10 59 d ago also EUVD-2026-74613

cvss: 8.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits: 0; none known

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

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 59 d ago (2026-09-10)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.2	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Insyde Software InsydeH2O

Classification

Weakness

CWE-489 Active Debug Code

References

insyde.com /security-pledge/sa-2026004/

Sources

CVE List CVE-2026-6485
NVD CVE-2026-6485

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary