CVE-2026-8863
HIGH
NVD
CVSS Score
7.8
Severity
HIGH
Published
Jun 09, 2026
Vendor
unknown
Description
Multiple Microsoft-sigend UEFI SHIM bootloaders are vulnerable to SecureBoot bypass. An attacker with administrative privileges or the ability to modify the boot process could use one of the vulnerable shim bootloaders to bypass Secure Boot protections and execute arbitrary code before the operating system loads. Specific UEFI DBX update is required to block these vulnerable boot loaders.