Vulnerability Description
OpenClaude is an open-source coding-agent command line interface for cloud and local model providers. Prior to version 0.5.1, the OpenClaude MCP authentication flow starts a temporary local HTTP server to handle OAuth callbacks. To prevent CSRF attacks, the server validates a state parameter against an internally stored value. However, due to a logic flaw in the order of conditionals, an attacker can completely bypass this check and force the server to shut down — without knowing the state value at all. This issue has been patched in version 0.5.1.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Gitlawb | Openclaude | < 0.5.1 |
Related Weaknesses (CWE)
References
- https://github.com/Gitlawb/openclaude/commit/739b8d1f40fde0e401a5cbd2b9a55d88bd5Patch
- https://github.com/Gitlawb/openclaude/releases/tag/v0.5.1Release Notes
- https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854rExploitVendor Advisory
- https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854rExploitVendor Advisory
FAQ
What is CVE-2026-42073?
CVE-2026-42073 is a vulnerability with a CVSS score of 6.5 (MEDIUM). OpenClaude is an open-source coding-agent command line interface for cloud and local model providers. Prior to version 0.5.1, the OpenClaude MCP authentication flow starts a temporary local HTTP serve...
How severe is CVE-2026-42073?
CVE-2026-42073 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-42073?
Check the references section above for vendor advisories and patch information. Affected products include: Gitlawb Openclaude.