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.
Published: 2026-01-08
Score: 9.4 Critical
EPSS: 11.4% Moderate
KEV: No
Impact: Unauthorized Access via Authentication Bypass
Action: Restrict Accounts
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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History

Mon, 12 Jan 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Zimaspace
Zimaspace zimaos
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:o:zimaspace:zimaos:*:*:*:*:*:*:*:*
Vendors & Products Zimaspace
Zimaspace zimaos

Mon, 12 Jan 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Icewhaletech
Icewhaletech zimaos
Vendors & Products Icewhaletech
Icewhaletech zimaos

Thu, 08 Jan 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 08 Jan 2026 14:15:00 +0000

Type Values Removed Values Added
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.
Title ZimaOS has Authentication Bypass via System-Level Username
Weaknesses CWE-287
References
Metrics cvssV3_1

{'score': 9.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L'}


Subscriptions

Icewhaletech Zimaos
Zimaspace Zimaos
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-08T15:55:23.245Z

Reserved: 2026-01-05T17:24:36.929Z

Link: CVE-2026-21891

cve-icon Vulnrichment

Updated: 2026-01-08T14:52:30.079Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-08T14:15:57.403

Modified: 2026-01-12T17:13:00.240

Link: CVE-2026-21891

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-28T22:45:25Z

Weaknesses