CVE-2026-42073
OpenClaude
- Severity
- Medium
- Published
- June 2, 2026
- Last modified
- July 22, 2026
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 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
References
- github.comPatch
- github.comRelease Notes
- github.comExploitVendor Advisory
- github.comExploitVendor Advisory
Listed in
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