Vulnerability Details CVE-2026-42073
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 5.9%
CVSS Severity
CVSS v3 Score 6.5
References