WP Blockade <= 0.9.14 - Reflected Cross-Site Scripting via 'shortcode' Parameter

Wordfence Intelligence > Vulnerability Database > WP Blockade <= 0.9.14 - Reflected Cross-Site Scripting via 'shortcode' Parameter

6.1

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVE	CVE-2026-3481
CVSS	6.1 (Medium)
Publicly Published	May 21, 2026
Last Updated	May 22, 2026
Researcher	theviper17y

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.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

References

Vulnerability Details for WP Blockade – Visual Page Builder

WP Blockade – Visual Page Builder

Software Type	Plugin
Software Slug	wp-blockade (view on wordpress.org)
Patched?	No
Remediation	No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
Affected Version	<= 0.9.14

Recent vulnerabilities in WP Blockade – Visual Page Builder

WP Blockade <= 0.9.14 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Shortcode Execution via 'shortcode' Parameter

6.5

CVE-2026-3480

Apr 7, 2026

Researcher: theviper17y

#	Title	CVE ID	CVSS	Researchers	Date
1	WP Blockade <= 0.9.14 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Shortcode Execution via 'shortcode' Parameter	CVE-2026-3480	6.5	theviper17y	April 7, 2026

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