CVE-2026-42073 | OpenClaude is an open-source coding-agent command line inter… | CVSS 6.5 MEDIUM

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.

Metadata

CVE ID: CVE-2026-42073
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-04-23 19:17 UTC
Published: 2026-06-02 15:38 UTC
Last updated: 2026-06-02 17:40 UTC
Primary CWE: CWE-352
CWE-352: Cross-Site Request Forgery (CSRF)
Vendor / Product: Gitlawb / openclaude
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Gitlawb	openclaude	—	< 0.5.1

Weakness (CWE)

CWE	Source	Description
CWE-352	cna	CWE-352: Cross-Site Request Forgery (CSRF)
CWE-400	cna	CWE-400: Uncontrolled Resource Consumption

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References (3)

https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854r https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854r
https://github.com/Gitlawb/openclaude/commit/739b8d1f40fde0e401a5cbd2b9a55d88bd5124ad https://github.com/Gitlawb/openclaude/commit/739b8d1f40fde0e401a5cbd2b9a55d88bd5124ad
https://github.com/Gitlawb/openclaude/releases/tag/v0.5.1 https://github.com/Gitlawb/openclaude/releases/tag/v0.5.1