CVE-2026-8863
HIGH 7.8EPSS 0.1%
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.
- CVSS v3.1
- 7.8 HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.11% chance of exploitation in the next 30 days, 1th percentile
- Published
- 2026-06-09
- Updated
- 2026-06-10
Proof-of-concept exploits (1)
- 0xbekoo/CVE-2026-88631★ · 2026-07-25