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CVE-2026-34200

Nhost CLI MCP Server: Missing Inbound Authentication on Explicitly Bound Network Port

Published: Mar 31, 2026Updated: Apr 7, 2026 Sources: CVE List NVDCWE-306
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 72.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-306CWE-942

Affected Products

nhostnhost
SaaS
Cloud & SaaS / api-gateway
clinhost
SaaS
Cloud & SaaS / api-gateway
nhostcommercialCloud & SaaSaka nhost/auth, nhost cli

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
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References

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

Timeline

Published
Mar 31, 2026
Last Updated
Apr 7, 2026

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