CVE-2026-42073
CVE-2026-42073 · OpenClaude's MCP OAuth Callback: State Check Bypass via error Param Leads to DoS
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 6.5 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
openclaude
- Versions
- < 0.5.1: Affected
No fix published
@gitlawb/openclaude npm
- Affected ranges
- SEMVER: < 0.5.1
Update to 0.5.1