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Lyrion Music Server 9.2.0 (server.log) Unauthenticated Reflected XSS

Critical
Advisory ID
ZSL-2026-5988
Release Date
05 June 2026
Vendor
LMS Community - https://www.lyrion.org
Affected Version
9.2.0
Tested On
Windows 10 (64-bit) - EN, Lyrion Music Server (9.2.0 - 1779973211), Perl/5.32.1, SQLite
Summary

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).

Description

Lyrion Music Server suffers from an unauthenticated reflected cross-site scripting vulnerability through 'server.log' endpoint abusing the 'search' GET parameter. Input is not properly sanitized before being returned to the user, allowing the execution of arbitrary HTML/JS code in a user's browser session in the context of the affected site.

Proof of Concept
Disclosure Timeline
27.05.2026Vulnerability discovered.
28.05.2026Contact with the vendor.
28.05.2026Vendor responds asking more details.
31.05.2026Sent details to the vendor.
31.05.2026Vendor is working on fixes and hardening security defaults.
02.06.2026Replied to the vendor.
05.06.2026Public security advisory released.
Credits
Vulnerability discovered by Gjoko Krstic
References
Changelog
05.06.2026Initial release