CVE-2026-42073
Last modified
CVE-2026-42073 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gitlawb | Openclaude | < 0.5.1 |
References
- https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854rExploit, Vendor Advisory
- https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854rExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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