What’s Vulnerable › Vulnerabilities

CVE-2026-34200: Nhost CLI MCP Server: Missing Inbound Authentication on Explicitly Bound Network Port

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-306

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 cli: before 1.41.0 — fixed in 1.41.0

How to fix

Upgrade to a fixed version: nhost cli 1.41.0. Check the vendor advisory for mitigations.

References

• https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9
• https://github.com/nhost/nhost/pull/4060
• https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2
• https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2

Get alerted when CVE-2026-34200 or the next vulnerability affects your stack