The Element Pack Addons for Elementor – Best Elementor addons with Ready Templates, Blocks, Widgets and WooCommerce Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'marker_content’ parameter in all versions up to, and including, 5.11.2 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.