WWBN AVideo is an open source video platform. In versions 29.0 and below, the "isValidDuration()" regex at "objects/video.php:918" uses "/^[0-9]{1,2}:[0-9]{1,2}:[0-9]{1,2}/" without a "$" end anchor, allowing arbitrary HTML/JavaScript to be appended after a valid duration prefix. The crafted duration is stored in the database and rendered without HTML escaping via "echo Video::getCleanDuration()" on trending pages, playlist pages, and video gallery thumbnails, resulting in stored cross-site scripting. Commit bcba324644df8b4ed1f891462455f1cd26822a45 contains a fix.