The HTML5 Video Player – mp4 Video Player Plugin and Block plugin for WordPress is vulnerable to DOM-Based Stored Cross-Site Scripting via the ‘heading’ parameter in all versions up to, and including, 2.5.35 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Missing Authorization vulnerability in bPlugins LLC Flash & HTML5 Video allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Flash & HTML5 Video: from n/a through 2.5.30.

The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

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 before 2.5.27 does not sanitize and escape a parameter from a REST route before using it in a SQL statement, allowing unauthenticated users to perform SQL injection attacks

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

Multiple cross-site scripting (XSS) vulnerabilities in videoplayer/autoplay.php in the HTML5 Video Player with Playlist plugin 2.4.0 and earlier for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) theme or (2) playlistmod parameter.

Cross-site request forgery (CSRF) vulnerability in the JW Player plugin before 2.1.4 for WordPress allows remote attackers to hijack the authentication of administrators for requests that remove players via a delete action to wp-admin/admin.php.