What’s Vulnerable › Vulnerabilities

CVE-2023-37266: Weak json web token (JWT) secrets in CasaOS

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-07-17 · updated 2026-06-17
• Weakness: CWE-287

Description

CasaOS is an open-source Personal Cloud system. Unauthenticated attackers can craft arbitrary JWTs and access features that usually require authentication and execute arbitrary commands as `root` on CasaOS instances. This problem was addressed by improving the validation of JWTs in commit `705bf1f`. This patch is part of CasaOS 0.4.4. 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.

Affected products

• IceWhaleTech CasaOS-UserService: before 0.4.4 — fixed in 0.4.4

How to fix

Upgrade to a fixed version: IceWhaleTech CasaOS-UserService 0.4.4. Check the vendor advisory for mitigations.

References

• https://github.com/IceWhaleTech/CasaOS/commit/705bf1facbffd2ca40b159b0303132b6fdf657ad
• https://github.com/IceWhaleTech/CasaOS/security/advisories/GHSA-m5q5-8mfw-p2hr
• https://www.sonarsource.com/blog/security-vulnerabilities-in-casaos
• https://github.com/IceWhaleTech/CasaOS/commit/705bf1facbffd2ca40b159b0303132b6fdf657ad
• https://github.com/IceWhaleTech/CasaOS/security/advisories/GHSA-m5q5-8mfw-p2hr

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