Critical Security Flaw in Default Configuration: Empty JWT_SECRET Allows Token Forgery

A default configuration file in a software project contains a critical security vulnerability that could allow attackers to forge authentication tokens. The `.env.example` file, intended as a setup template, leaves the `JWT_SECRET` and `ENCRYPTION_KEY` fields empty. While the system is configured to halt startup if the `ENCRYPTION_KEY` is missing, it silently accepts an empty `JWT_SECRET`, creating a severe, hidden security hole.

The inconsistency lies in the `docker-compose.yml` file. It uses a bash error syntax (`?`) to enforce the `ENCRYPTION_KEY`, causing a startup failure with a clear error. However, the `JWT_SECRET` variable lacks this enforcement, allowing the server to start with a blank secret. This means any user who follows the standard setup instructions—copying the `.env.example` file to create their `.env`—will unknowingly deploy an application vulnerable to JWT token forgery.

The impact is high and creates a dual problem for developers. They will either encounter a confusing startup error for the missing encryption key, or, more dangerously, their application will run with a compromised authentication system. This flaw turns a routine setup step into a potential security incident, exposing any service built on this default configuration to unauthorized access. The silent nature of the `JWT_SECRET` failure makes it particularly insidious, as there is no immediate warning of the vulnerability.