The HTML5 Video Player – mp4 Video Player Plugin and Block plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on multiple functions called via the 'h5vp_ajax_handler' ajax action in all versions up to, and including, 2.5.32. This makes it possible for unauthenticated attackers to call these functions to manipulate data.

The HTML5 Video Player – mp4 Video Player Plugin and Block plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'save_password' function in all versions up to, and including, 2.5.34. This makes it possible for authenticated attackers, with Subscriber-level access and above, to set any options that are not explicitly checked as false to an array, including enabling user registration if it has been disabled.

The 'HTML5 Video Player' WordPress Plugin, version < 2.5.25 is affected by an unauthenticated SQL injection vulnerability in the 'id' parameter in the  'get_view' function.

The Html5 Video Player WordPress plugin before 2.5.19 does not sanitise and escape some of its player settings, which combined with missing capability checks around the plugin could allow any authenticated users, such as low as subscribers to perform Stored Cross-Site Scripting attacks against high privilege users like admins