CSRF in Gitlawb Openclaude
CVE-2026-42073
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.
Vulnerability class: CSRF (Cross-Site Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (17.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000
Affected products
- Gitlawb Openclaude — versions < 0.5.1
Weakness classification (CWE)
References
- github.com/Gitlawb/openclaude/commit/739b8d1f40fde0e401a5cbd2b9a55d88bd5124ad (Patch)
- github.com/Gitlawb/openclaude/releases/tag/v0.5.1 (Release Notes)
- github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854r (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42073?
- CVE-2026-42073 is a medium-severity vulnerability in Gitlawb Openclaude, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.5/10. Published 2026-06-02.
- How severe is CVE-2026-42073?
- Medium severity. CVSS v3 base score is 6.5 out of 10.