EUVD-2026-1670

ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI. In versions up to and including 1.5.0, the application checks the validity of the username but appears to skip, misinterpret, or incorrectly validate the password when the provided username matches a...

CVE-2026-21891 ZimaOS has Authentication Bypass via System-Level Username

ZimaOS is a fork of CasaOS, an operating system for Zima devices and x86-64 systems with UEFI. In versions up to and including 1.5.0, the application checks the validity of the username but appears to skip, misinterpret, or incorrectly validate the password when the provided username matches a...

CVE-2026-21891

Summary (CVE-2026-21891): ZimaOS ≤ 1.5.0 contains an authentication bypass in the login function where username validation is performed but password handling for known system service accounts is flawed. This can allow an attacker to gain authenticated access using any password when a common syste...