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.
History

Tue, 02 Jun 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Gitlawb
Gitlawb openclaude
Vendors & Products Gitlawb
Gitlawb openclaude

Tue, 02 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 02 Jun 2026 17:15:00 +0000

Type Values Removed Values Added
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
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-02T17:40:55.678Z

Reserved: 2026-04-23T19:17:30.565Z

Link: CVE-2026-42073

cve-icon Vulnrichment

Updated: 2026-06-02T17:37:38.903Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-06-02T17:16:31.910

Modified: 2026-06-02T17:19:53.963

Link: CVE-2026-42073

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-02T18:30:15Z