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The channel/<ucid>/playlists page was vulnerable to Cross Site Scripting (XSS), because the different URL parameters were inserted as-is in the URL meant for instance switching. This vulnerability could allow an attacker to inject malicious Javascript in the page by tricking the user to click on a crafted link. Bug introduced in commit 66e7285108363c3c3dcb814bdffb716c14e1724d ("Only use /redirect when automatically redirecting"). Thanks to Jack (@testa:cthd.icu on Matrix, @cysea on github) for responsibly reporting this issue!