Vulnerability Description
Nhost is an open source Firebase alternative with GraphQL. Prior to version 1.41.0, The Nhost CLI MCP server, when explicitly configured to listen on a network port, applies no inbound authentication and does not enforce strict CORS. This allows a malicious website visited on the same machine to issue cross-origin requests to the MCP server and invoke privileged tools using the developer's locally configured credentials. This vulnerability requires two explicit, non-default configuration steps to be exploitable. The default nhost mcp start configuration is not affected. This issue has been patched in version 1.41.0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nhost | Cli | < 1.41.0 |
Related Weaknesses (CWE)
References
- https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9Patch
- https://github.com/nhost/nhost/pull/4060Issue TrackingPatch
- https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2ExploitVendor Advisory
- https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2ExploitVendor Advisory
FAQ
What is CVE-2026-34200?
CVE-2026-34200 is a vulnerability with a CVSS score of 7.5 (HIGH). Nhost is an open source Firebase alternative with GraphQL. Prior to version 1.41.0, The Nhost CLI MCP server, when explicitly configured to listen on a network port, applies no inbound authentication ...
How severe is CVE-2026-34200?
CVE-2026-34200 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34200?
Check the references section above for vendor advisories and patch information. Affected products include: Nhost Cli.