Missing Authentication Vulnerability in Nango Runner tRPC Server

CVE-2026-9317

What is CVE-2026-9317?

CVE-2026-9317 is a vulnerability found in the Nango Runner tRPC server, a component of the Nango software by Nangohq, designed to facilitate backend integration and data management. This particular vulnerability stems from a lack of proper authentication measures in the server, allowing unauthenticated attackers to execute arbitrary JavaScript code remotely. The issue arises when malicious actors exploit the exposed start procedure, which is not adequately protected by the RUNNER_SECRET_KEY environment variable. If an attacker can access the network where the server is running, they can send requests to this vulnerable endpoint, potentially leading to unauthorized access and manipulation of critical server processes.

Potential impact of CVE-2026-9317

1. Remote Code Execution: The most significant impact of this vulnerability is the potential for remote code execution (RCE). Attackers can execute arbitrary JavaScript code within the server's environment, allowing them to manipulate server behavior, access sensitive data, or deploy malicious payloads.

2. Unauthorized System Access: This vulnerability bypasses authentication requirements, granting attackers the ability to gain unauthorized access to the server's functionalities and underlying systems, which could lead to further security breaches.

3. Data Compromise: With the ability to execute code remotely, attackers may gain access to sensitive information stored within the system, leading to data breaches that could expose sensitive customer or organizational data, resulting in compliance violations and reputational damage.

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