Download Plugins and Themes from Dashboard <= 1.9.6 - Cross-Site Request Forgery to Bulk Plugin/Theme Archival

The Download Plugins and Themes in ZIP from Dashboard plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.9.6. This is due to missing or incorrect nonce validation on the download_plugin_bulk and download_theme_bulk functions. This makes it possible for unauthenticated attackers to archive all the sites plugins and themes and place them in the `wp-content/uploads/` directory via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.