CVE-2026-8863
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk0th percentile - higher than 0% of all known CVEs
Summary
Multiple Microsoft-signed UEFI SHIM bootloaders are vulnerable to Secure Boot 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.
Risk Assessment
The organization may be exposed to the execution of malicious code, potentially leading to data loss and system integrity breaches. Bypassing Secure Boot poses a serious threat to the overall security of the IT infrastructure.
Recommendation
It is recommended to update the UEFI DBX to block these vulnerable bootloaders. Additionally, access to boot processes should be monitored and restricted to minimize risk.
Original NVD description (English source)
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.