CVE & CISA-KEV Catalog

CVE-2026-42073

MEDIUM
6.5
CVSS v3
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.

CWE-352Cross-Site Request ForgeryCWE-400Resource Exhaustion

How to fix

Remediation Available
openclaudeNVD
Affected:< 0.5.1Fixed in:0.5.1CVE-2026-42073derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

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

Exploit Intelligence

0.22%probability of exploitation in 30 days
12thpercentile

Low risk: more likely to be exploited than 12% of all known CVEs.

References

Exploit1
Release Notes1

Related Vulnerabilities

Other CWE-352 (Cross-Site Request Forgery) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2016-6277High8.8100%KEV-
CVE-2014-0054Medium6.891%-Fix
CVE-2013-6429Medium6.890%-Fix
CVE-2022-41622High8.888%--
CVE-2018-7700High8.875%--
CVE-2015-2295Medium6.866%--
Embed a live status badge for CVE-2026-42073
CVE-2026-42073 severity badge

Markdown

[![CVE-2026-42073](https://tridentstack.com/cve/badge/CVE-2026-42073.svg)](https://tridentstack.com/cve/CVE-2026-42073)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-42073"><img src="https://tridentstack.com/cve/badge/CVE-2026-42073.svg" alt="CVE-2026-42073"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-03.