CVE-2026-34200
Nhost CLI MCP Server: Missing Inbound Authentication on Explicitly Bound Network Port
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.
INFO
Published Date :
March 31, 2026, 3:16 p.m.
Last Modified :
April 7, 2026, 9:08 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Nhost CLI to version 1.41.0.
- Ensure network port configuration is secure.
- Review and enforce CORS policies.
Public PoC/Exploit Available at Github
CVE-2026-34200 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34200.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34200 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34200
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34200 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34200 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-306 Added CPE Configuration OR *cpe:2.3:a:nhost:cli:*:*:*:*:*:*:*:* versions up to (excluding) 1.41.0 Added Reference Type GitHub, Inc.: https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/nhost/nhost/pull/4060 Types: Issue Tracking, Patch Added Reference Type CISA-ADP: https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2 Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2 Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-306 Added CWE CWE-942 Added Reference https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9 Added Reference https://github.com/nhost/nhost/pull/4060 Added Reference https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 31, 2026
Action Type Old Value New Value Added Reference https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2