CVE-2026-8863
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
Multiple Microsoft-signed 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.
Risk Assessment
An attacker can gain full control over the system boot process by installing malware before the OS loads, allowing persistent compromise of the device.
Recommendation
Apply the UEFI DBX update provided by the motherboard manufacturer or OEM to block the vulnerable SHIM bootloaders.
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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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

