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

Quick assessment

Affected
Gitlawb openclaude
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenClaude是Gitlawb开源的一个支持多后端的开源编码助手CLI。 OpenClaude 0.5.1之前版本存在安全漏洞，该漏洞源于MCP认证流程中条件顺序逻辑缺陷导致攻击者完全绕过state参数验证，可能强制服务器关闭。

CVSS 6.5 · Medium EPSS 0.26% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
Gitlawb openclaude < 0.5.1 affected
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I. Basic Information for CVE-2026-42073

Vulnerability Information
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Vulnerability Title
OpenClaude's MCP OAuth Callback: State Check Bypass via error Param Leads to DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
OpenClaude 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenClaude是Gitlawb开源的一个支持多后端的开源编码助手CLI。 OpenClaude 0.5.1之前版本存在安全漏洞，该漏洞源于MCP认证流程中条件顺序逻辑缺陷导致攻击者完全绕过state参数验证，可能强制服务器关闭。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Gitlawb openclaude < 0.5.1 -

II. Public POCs for CVE-2026-42073

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III. Intelligence Information for CVE-2026-42073

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Patches & Fixes for CVE-2026-42073 (1)

Vendor Advisories for CVE-2026-42073 (1)

Other References for CVE-2026-42073 (1)

IV. Related Vulnerabilities

Same product: openclaude
Same vendor: Gitlawb
Same weakness: CWE-352

V. Comments for CVE-2026-42073

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