CVE-2026-42073
To prevent CSRF attacks, the server validates a state parameter against an internally stored value.
Does this matter?
Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own.
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
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- EPSS
- 0.26% probability · 17th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-352, CWE-400
- Affected
- gitlawb/openclaude
- Source
- security-advisories@github.com
References
- https://github.com/Gitlawb/openclaude/commit/739b8d1f40fde0e401a5cbd2b9a55d88bd5124adPatch
- https://github.com/Gitlawb/openclaude/releases/tag/v0.5.1Release Notes
- https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854rExploit, Vendor Advisory
- https://github.com/Gitlawb/openclaude/security/advisories/GHSA-c73c-x77g-854rExploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.