CVE-2026-34200

Name: CVE-2026-34200
Creator: NVD / NIST
Published: 2026-03-31T15:16:17.67+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.7/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2026-34200 is a high-severity vulnerability rated 7.7/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS 4.0

7.7/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.36%

27.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nhost	Cli	< 1.41.0

References

https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9Patch
https://github.com/nhost/nhost/pull/4060Issue Tracking, Patch
https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2Exploit, Vendor Advisory
https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2Exploit, Vendor Advisory

Timeline

Published: Mar 31, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34200?

How severe is CVE-2026-34200?

CVE-2026-34200 has a CVSS score of 7.7/10 (HIGH severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34200?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34200?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST