Lyrion Music Server (formerly Logitech Media Server, and often abbreviated as "LMS" ) is open-source software which can control and serve (stream) music to a wide range of physical and virtual audio players called Squeezeboxes. Lyrion Music Server can stream your local music collection, internet radio stations, and content from many streaming services (with and without subscriptions).
The server suffers from a directory traversal vulnerability. Exploiting this issue will allow an unauthenticated attacker to view arbitrary files within the context of the web server.