lichess.org has an Unsanitized Stream Title Injection on /streamer
Platform
javascript
Component
lila
Fixed in
0d5002696ae705e1888bf77de107c73de57bb1b3
lichess.org is the forever free, adless and open source chess server. Any approved streamer can inject arbitrary HTML into /streamer and the homepage “Live streams” widget by placing markup in their Twitch/YouTube stream title. CSP is present and blocks inline script execution, but the issue is still a server-side HTML injection sink. To trigger this, a Lichess account only needs to satisfy the normal streamer requirements and get approved. Per Streamer.canApply, that means an account older than 2 days with at least 15 games, or a verified/titled account. After moderator approval, once the streamer goes live, Lichess pulls the platform title and renders it into the UI as-is. No extra privileges are needed beyond a normal approved streamer profile. This vulnerability is fixed with commit 0d5002696ae705e1888bf77de107c73de57bb1b3.
How to fix
Actualizar a la versión 0d5002696ae705e1888bf77de107c73de57bb1b3 o superior para evitar la inyección de HTML no sanitizado en los títulos de los streams. La actualización corrige la forma en que Lichess maneja los títulos de los streams, asegurando que el HTML inyectado sea correctamente sanitizado antes de ser renderizado en la interfaz de usuario.
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