Summary
CasaOS contains weak JWT secrets
Workarounds
Users should upgrade to CasaOS 0.4.4. If they can't, they should temporarily restrict access to CasaOS to untrusted users, for instance by not exposing it publicly.
References
Impact
Unauthenticated attackers can craft arbitrary JWTs and access features that usually require authentication and execute arbitrary commands as root on CasaOS instances.
The application does not adequately verify the identity of a user, device, or process before granting access. Typical impact: unauthorized access to functions or data reserved for authenticated parties.
CVE-2023-37266 has a CVSS score of 9.8 (Critical). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.4.4); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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The problem was addressed by improving the validation of JWTs in 705bf1f. This patch is part of CasaOS 0.4.4.
Frequently Asked Questions
- What is CVE-2023-37266? CVE-2023-37266 is a critical-severity improper authentication vulnerability in github.com/IceWhaleTech/CasaOS (go), affecting versions < 0.4.4. It is fixed in 0.4.4. The application does not adequately verify the identity of a user, device, or process before granting access.
- How severe is CVE-2023-37266? CVE-2023-37266 has a CVSS score of 9.8 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of github.com/IceWhaleTech/CasaOS are affected by CVE-2023-37266? github.com/IceWhaleTech/CasaOS (go) versions < 0.4.4 is affected.
- Is there a fix for CVE-2023-37266? Yes. CVE-2023-37266 is fixed in 0.4.4. Upgrade to this version or later.
- Is CVE-2023-37266 exploitable, and should I be worried? Whether CVE-2023-37266 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2023-37266 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2023-37266? Upgrade
github.com/IceWhaleTech/CasaOSto 0.4.4 or later.