Description
Nhost is an open source Firebase alternative with GraphQL. In versions of Nhost CLI prior to 1.46.0, the hidden `nhost configserver` used by `nhost dev` exposes the Mimir GraphQL API with dummy authorization directives and permissive CORS. When a developer is running the local development environment, any process that can reach the developer's localhost service, including a web page loaded from an arbitrary origin, can query the configserver for local Nhost configuration and secrets and can mutate the local `.secrets` file. This impacts developers using `nhost dev`: project admin secrets, JWT signing keys, webhook secrets, Grafana credentials, and custom environment variables can be read, and attacker-controlled secrets can be written to the local development project. Version 1.46.0 of Nhost CLI contains a fix.
Affected products
nhost: cli
References5
- github.com/nhost/nhost/security/advisories/GHSA-64cj-qvx5-m4f3 ExploitMitigationVendor Advisory
- github.com/nhost/nhost/security/advisories/GHSA-64cj-qvx5-m4f3 ExploitMitigationVendor Advisory
- github.com/nhost/nhost/commit/e407511627d2c2c1137a70e9ca1ca3109… Patch
- github.com/nhost/nhost/pull/4302 Issue TrackingPatch
- github.com/nhost/nhost/releases/tag/[email protected] ProductRelease Notes
Metrics
- CVSS 3.1
-
5.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 30 · as of 14 November 2026
- CWE
- CWE-306
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.