Cisco UCS UEFI Shell flaw (CVE-2026-20293) lets attackers bypass Secure Boot and run unauthorized software
Cisco disclosed CVE-2026-20293, a high-severity UEFI Secure Boot bypass in the UEFI Shell of Cisco UCS Servers and UCS-based appliances. An authenticated attacker with a user or admin role, or an unauthenticated attacker with physical access, can bypass Secure Boot validation and execute unauthorized software. Cisco has released software …