The plugin contains a Stored Cross-Site Scripting issue within the `vc raw html` shortcode. The `vc raw html::render()` function fails to properly sanitize input and escape output by base64-decoding shortcode content and inserting it directly into the page HTML. This process bypasses the `wp kses post()` filter, which is a WordPress function used to sanitize HTML content, because the filter does not decode base64 text. Consequently, authenticated attackers with Contributor-level access or higher can inject arbitrary web scripts that execute when a user, such as an Editor or Administrator, views the affected page.