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.
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History
Tue, 02 Jun 2026 18:45:00 +0000
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Tue, 02 Jun 2026 17:15:00 +0000
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| 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. | |
| Title | OpenClaude's MCP OAuth Callback: State Check Bypass via error Param Leads to DoS | |
| Weaknesses | CWE-352 CWE-400 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-02T17:40:55.678Z
Reserved: 2026-04-23T19:17:30.565Z
Link: CVE-2026-42073
Updated: 2026-06-02T17:37:38.903Z
Status : Undergoing Analysis
Published: 2026-06-02T17:16:31.910
Modified: 2026-06-02T17:19:53.963
Link: CVE-2026-42073
No data.
OpenCVE Enrichment
Updated: 2026-06-02T18:30:15Z