CVE-2026-47671: Nhost CLI local configserver allows cross-origin unauthenticated read/write access to local development configuration and secrets

Vulnerability summary

CVE-2026-47671 is a medium (CVSS 5.4) vulnerability in nhost cli. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 29.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 21-07-2026
   PublishedVulnerability first disclosed.
2. 22-07-2026
   Last modifiedVulnerability information updated.

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.

• CWE-306Missing Authentication for Critical FunctionalityThe product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.