cvedb.io
CVE-2026-21891
CRITICAL · CVSS 9.4
EPSS exploitation probability: 0%
Published 2026-01-08T14:15:57.403 · Last modified 2026-06-17T10:19:05.990

Summary

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.

Affected products

zimaspace — zimaos

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.