CVE-2026-42073 — OpenClaude's MCP OAuth Callback: State Check Bypass via error Param Leads to DoS
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 tem…
Published: 2026-06-02 · CVSS: 6.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7