WP Blockade – Visual Page Builder, CVE-2026-3481

CVE, Research URL: CVE-2026-3481
Home page URL: Security reports for WP Blockade – Visual Page Builder
Application: WP Blockade – Visual Page Builder
Published on: May 22, 2026
Research Description: The WP Blockade plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'shortcode' parameter in all versions up to and including 0.9.14. This is due to insufficient input sanitization and output escaping in the render_shortcode_preview() function. The function receives user input from $_GET['shortcode'], passes it through stripslashes() without any sanitization, and then outputs it directly via echo do_shortcode($shortcode) on line 393. When the input is not a valid WordPress shortcode (e.g., an HTML tag with JavaScript event handlers), do_shortcode() returns it unchanged, and it is reflected into the page without escaping. The endpoint is registered via admin_post_ (not admin_post_nopriv_), meaning it requires the user to be logged in with at minimum a Subscriber-level account. There is no nonce verification or additional capability check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that will execute if they can successfully trick a user into performing an action such as clicking a link.
Affected versions: max 0.9.14.
Status: vulnerable

WP Blockade &#8211; Visual Page Builder, CVE-2026-3481