Multiple unrestricted file upload vulnerabilities in (1) media-upload.php, (2) media-upload-lncthumb.php, and (3) media-upload-sq_button.php in lib/admin/ in the OptimizePress theme before 1.61 for WordPress allow remote attackers to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in images_comingsoon, images_lncthumbs, or images_optbuttons in wp-content/uploads/optpress/, as exploited in the wild in November 2013.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.