Unrestricted file upload vulnerability in the Tribulant Slideshow Gallery plugin before 1.4.7 for WordPress allows remote authenticated users to execute arbitrary code by uploading a PHP file, then accessing it via a direct request to the file in wp-content/uploads/slideshow-gallery/.
https://wordpress.org/plugins/slideshow-gallery/changelog
https://exchange.xforce.ibmcloud.com/vulnerabilities/95676
http://www.securityfocus.com/archive/1/533281/100/0/threaded