CVE-2026-42073 – OpenClaude’s MCP OAuth Callback: State Check Bypass via error Param Leads to DoS

CVE ID :CVE-2026-42073

Published : June 2, 2026, 5:16 p.m. | 1 hour, 16 minutes ago

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.

Severity: 6.5 | MEDIUM

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