CVE-2026-34200

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.6 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9	Patch
https://github.com/nhost/nhost/pull/4060	Issue Tracking Patch
https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2	Exploit Vendor Advisory
https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:nhost:cli:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-31 15:16

Updated : 2026-07-24 21:10

NVD link : CVE-2026-34200

Mitre link : CVE-2026-34200

CVE.ORG link : CVE-2026-34200

JSON object : View

Products Affected

nhost

cli

CWE

CWE-306

Missing Authentication for Critical Function

CWE-942

Permissive Cross-domain Security Policy with Untrusted Domains

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