Description

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 known system service account. The application's login function fails to properly handle the password validation result for these users, effectively granting authenticated access to anyone who knows one of these common usernames and provides any password. As of time of publication, no known patched versions are available.

INFO

Published Date :

2026-01-08T14:00:14.578Z

Last Modified :

2026-01-08T15:55:23.245Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21891 vulnerability.

Vendors Products
Icewhaletech
  • Zimaos
Zimaspace
  • Zimaos
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21891.

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact