CVE-2026-6485

Secure Boot is like a gatekeeper that helps ensure only trusted software can start when the computer boots. This issue is a way to get around that gatekeeper using the firmware’s built-in startup shell—so a determined attacker who already has strong local access could potentially make malicious code run at boot. Think of it as finding a door inside the building that lets someone bypass the front-desk security check.

This matters if you operate devices that use InsydeH2O UEFI firmware. It’s relevant when someone with high privileges on the local machine can reach the UEFI BIOS environment. It’s not a typical “internet attack” because the findings indicate local access and high privileges are required.

This is a RED issue because an attacker who already has high-level local access can bypass Secure Boot, enabling deeper compromise and startup persistence. Even though remote exploitation isn’t established in the findings, local attackers (including insiders or those who already landed on a machine) can use it to significantly weaken the boot security chain.