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.
Published: 2026-06-02
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-c73c-x77g-854r OpenClaude MCP OAuth Callback: State Check Bypass via error Param Leads to DoS
History

Wed, 03 Jun 2026 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:gitlawb:openclaude:*:*:*:*:*:*:*:*

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'}


Subscriptions

Gitlawb Openclaude
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 : Analyzed

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

Modified: 2026-06-03T16:54:29.273

Link: CVE-2026-42073

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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

Weaknesses