WWBN AVideo is an open source video platform. In versions up to and including 26.0, the "downloadVideoFromDownloadURL()" function in "objects/aVideoEncoder.json.php" saves remote content to a web-accessible temporary directory using the original URL's filename and extension (including ".php"). By providing an invalid "resolution" parameter, an attacker triggers an early "die()" via "forbiddenPage()" before the temp file can be moved or cleaned up, leaving an executable PHP file persistently accessible under the web root at "videos/cache/tmpFile/". Commit 6da79b43484099a0b660d1544a63c07b633ed3a2 contains a patch.