High 7.7Published Mar 31, 2026

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

Updated under an hour ago (Oct 26, 2026, 11:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-306, CWE-942
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nhost nhost nhost:nhost (from the name)	before 1.41.0	CNA record
nhost cli nhost:cli	before 1.41.0	NVD

References

References

https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2	x-refsource-confirm, exploit, vendor-advisory
https://github.com/nhost/nhost/pull/4060	x-refsource-misc, issue-tracking, patch
https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.