GHSA-2FP4-5V5C-4448 gonic: Path Traversal in playlist `id` bypasses ownership check, enabling any user to read/delete other users' playlists

Summary The maintainer's recent fix in 6dd71e6a3c966867ef8c900d359a7df75789f410 fixsubsonic: enforce playlist ownership on getPlaylist/deletePlaylist added an ownership check based on playlist.UserID. However, playlist.UserID is derived from the first path segment of the attacker-controlled...