# CVE-2026-49352

## Summary

9router hardcoded default fallback JWT secret allows authentication bypass

## Description

9router npm package >=0.2.21 and <=0.4.41 uses the publicly known hardcoded string '9router-default-secret-change-me' as the fallback JWT secret when the JWT_SECRET environment variable is not set. Any unauthenticated remote attacker can forge a valid auth_token cookie and gain full access to the dashboard and API. Affected code is in src/app/api/auth/login/route.js and src/middleware.js (v0.2.21-v0.4.30) and src/lib/auth/dashboardSession.js (v0.4.31-v0.4.41). Fixed in 0.4.45. Target: run 9router without JWT_SECRET, sign a JWT with the known secret, set it as auth_token cookie, and access /dashboard.

## Metadata

- Product: 9router
- Severity: critical
- Status: open