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Vulnerability record · CVE-2026-42073 · published 2 June 2026

CVE-2026-42073: Gitlawb openclaude cross-site request forgery vulnerability

Gitlawb · Openclaude

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.

6.5 CVSS 3.1 Medium EPSS 0.29% · top 80.8% CWE-352 · Cross-site request forgeryCWE-400 · Uncontrolled resource consumption
6.5CVSS 3.1 base score
0.29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
22 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Gitlawb/openclaude/commit/739b8d1f40fde0e401a5cbd2b9a55d88bd5124ad Patch
https://github.com/Gitlawb/openclaude/releases/tag/v0.5.1 Release Notes
https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854r ExploitVendor Advisory
https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854r ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-42073), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.