Cross-site scripting (XSS) vulnerability in views/video-management/preview_video.php in the S3 Video plugin before 0.983 for WordPress allows remote attackers to inject arbitrary web script or HTML via the base parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/89866
http://www.securityfocus.com/bid/64420
http://wordpress.org/plugins/s3-video/changelog