CVE-2026-47671 in Nhost
Summary
by MITRE • 07/21/2026
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.
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Analysis
by VulDB Data Team • 07/21/2026
The vulnerability identified in Nhost CLI versions prior to 1.46.0 represents a critical security flaw in the local development environment configuration that exposes sensitive administrative data through improper access controls and network exposure. This issue affects developers using the nhost dev command which leverages a hidden configserver component to manage local development configurations. The exposed Mimir GraphQL API interface operates with dummy authorization directives that provide no actual protection against unauthorized access, creating an attack surface where local development environments become vulnerable to exploitation by any process capable of reaching the developer's localhost service.
The technical implementation of this vulnerability stems from the improper configuration of CORS (Cross-Origin Resource Sharing) policies within the hidden configserver component. The permissive CORS settings allow requests from arbitrary origins, enabling web pages loaded from external domains to interact with the local development server. This misconfiguration creates a pathway where attackers can query the configserver for local Nhost configuration details and secrets without proper authentication or authorization mechanisms. The vulnerability specifically impacts the exposure of sensitive data including project admin secrets, JWT signing keys, webhook secrets, Grafana credentials, and custom environment variables that are typically protected in production environments but remain accessible in the development context due to inadequate security controls.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass complete administrative control over local development projects. Attackers who can reach the developer's localhost service can not only read sensitive configuration data but also write attacker-controlled secrets to the local `.secrets` file, potentially leading to privilege escalation and persistent access to development environments. This represents a significant risk for developers working on applications that rely on Nhost's GraphQL capabilities, as it allows unauthorized parties to gain insight into development configurations and potentially manipulate the local environment in ways that could compromise application integrity. The vulnerability affects all developers using `nhost dev` command in affected versions, creating a widespread security concern across the Nhost development community.
The fix implemented in version 1.46.0 addresses this vulnerability by properly configuring authorization mechanisms and restricting CORS policies to prevent unauthorized access to the configserver component. This remediation aligns with security best practices outlined in CWE-346 (Origin Validation) and CWE-284 (Improper Access Control) standards, which emphasize the importance of proper authorization controls and origin validation for web applications. Organizations following ATT&CK framework should recognize this vulnerability as representing techniques related to credential access and privilege escalation through insecure local development environments. The mitigation strategy involves implementing proper authentication mechanisms for the configserver component and restricting network exposure to only trusted local processes, ensuring that sensitive development data remains protected even in local development contexts where traditional security controls might be relaxed.
Development teams should immediately upgrade to Nhost CLI version 1.46.0 or later to address this vulnerability, while also implementing additional security measures such as network segmentation for development environments and regular security audits of local development configurations. The incident highlights the importance of securing all components within development toolchains, as vulnerabilities in local development tools can provide attackers with access to sensitive data that might otherwise remain protected in production environments. Security-conscious organizations should consider implementing automated scanning tools to identify similar misconfigurations in other development tools and frameworks used within their organization's development pipeline.