Missing Authorization Affecting 9router package, versions <0.4.45
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Missing Authorization vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-JS-9ROUTER-17817941
- published5 Jul 2026
- disclosed2 Jul 2026
- creditUnknown
Introduced: 2 Jul 2026
NewCVE-2026-59800 (opens in a new tab)How to fix?
Upgrade 9router to version 0.4.45 or higher.
Overview
9router is a 9Router CLI - Start and manage 9Router server
Affected versions of this package are vulnerable to Missing Authorization via the POST /api/tunnel/tailscale-install route handler, which accepts a JSON body containing a sudoPassword field and pipes it, along with the contents of an external script, into a child process executed as sudo -S sh. An attacker can execute arbitrary commands on the host system by sending a crafted unauthenticated POST request with malicious input in the sudoPassword field. This is only exploitable if the Node.js process is running as root, the user has NOPASSWD sudo privileges, or a recent sudo timestamp cache is present.