CVE-2026-8863

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.8 / 10

Vector String

                                        CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H                                    

Vulnerability 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.

Vulnerability Details

Published Date

June 09, 2026

Last Modified

June 09, 2026

Source

NVD

External References

https://kb.cert.org/vuls/id/616257
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8863
https://www.kb.cert.org/vuls/id/616257

CVE-2026-8863

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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