Executive brief
Lyrion Music Server is a media management platform used to stream music across home networks. A security flaw allows anyone with network access to view the contents of any folder on the host computer's hard drive without needing a password. This could lead to the exposure of sensitive personal files, system configuration details, or other private data stored on the server.
Technical details
Lyrion Music Server (formerly Logitech Media Server) contains an information exposure vulnerability (CWE-548) in its 'readdirectory' query. The vulnerability exists in both the CLI service (TCP port 9090) and the HTTP JSON-RPC endpoint (/jsonrpc.js). The query accepts a 'folder' parameter but fails to validate or restrict the path to configured media directories. Because the default configuration does not require authentication, a remote attacker can send crafted requests to list the contents of arbitrary directories on the underlying filesystem. This facilitates reconnaissance and the discovery of sensitive files, though it does not directly allow file downloads.
Affected products
- Lyrion Music Server <= 9.2.0
Timeline
- 2026-06-05: disclosed
- 2026-06-05: advisory