CVE-2026-34200 HIGH

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

Vendor Nhost
Product nhost
Weakness CWE-306 · Missing auth
Published March 31, 2026
Last update March 31, 2026
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CVSS base score

7.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 31, 2026 CVE published
March 31, 2026 Record updated