Multiple plugins for WordPress are vulnerable to Stored Cross-Site Scripting via the plugin's bundled FancyBox JavaScript library (versions 1.3.4 to 3.5.7) in various versions due to insufficient input sanitization and output escaping on user supplied attributes. 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.

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 WP Lead Plus X plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 0.99. This is due to missing or incorrect nonce validation on several functions. This makes it possible for unauthenticated attackers to perform administrative actions, such as adding pages to the site and/or replacing site content with malicious JavaScript via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The WP Page Builder WordPress plugin through 1.2.8 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

Multiple Auth. (author+) Stored Cross-Site Scripting (XSS) vulnerabilities in WP Page Builder plugin <= 1.2.6 on WordPress.

By default, the WP Page Builder WordPress plugin before 1.2.4 allows subscriber-level users to edit and make changes to any and all posts pages - user roles must be specifically blocked from editing posts and pages.

The editor of the WP Page Builder WordPress plugin before 1.2.4 allows lower-privileged users to insert unfiltered HTML, including JavaScript, into pages via the “Raw HTML” widget and the “Custom HTML” widgets (though the custom HTML widget requires sending a crafted request - it appears that this widget uses some form of client side validation but not server side validation), all of which are added via the “page_builder_data” parameter when performing the “wppb_page_save” AJAX action. It is also possible to insert malicious JavaScript via the “wppb_page_css” parameter (this can be done by closing out the style tag and opening a script tag) when performing the “wppb_page_save” AJAX action.

The nd-shortcodes plugin before 6.0 for WordPress has a nopriv_ AJAX action that allows modification of the siteurl setting.