# CVE-2026-34200

## Summary

- **CVE ID:** CVE-2026-34200
- **Severity:** HIGH
- **CVSS Score:** 7.7 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-306, CWE-942
- **Published:** Mar 31, 2026
- **Last Modified:** Mar 31, 2026

## 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.

## Affected Products

- nhost — nhost (< 1.41.0)

## References

- [CNA](https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2)
- [CNA](https://github.com/nhost/nhost/pull/4060)
- [CNA](https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 29.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._