Path Traversal and OS Command Injection in parisneo/lollms-webui

A vulnerability in the `start_app_server` function of parisneo/lollms-webui V12 (Strawberry) allows for path traversal and OS command injection. The function does not properly sanitize the `app_name` parameter, enabling an attacker to upload a malicious `server.py` file and execute arbitrary code by exploiting the path traversal vulnerability.