CVE-2026-3481
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
The WP Blockade plugin for WordPress up to version 0.9.14 is vulnerable to Reflected Cross-Site Scripting via the 'shortcode' parameter in the render_shortcode_preview() function, due to insufficient input sanitization and output escaping. The endpoint requires authentication (Subscriber-level or above) and lacks nonce verification or capability checks.
Risk Assessment
Authenticated attackers with Subscriber-level access or above can inject arbitrary scripts that execute if they trick a user into clicking a link, potentially leading to session theft or other attacks.
Recommendation
Update the WP Blockade plugin to the latest available version that fixes this vulnerability.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS