What the vulnerability does
01Description
The Essential Blocks – Page Builder Gutenberg Blocks, Patterns & Templates plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the blockId parameter in all versions up to, and including, 4.5.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor access or higher, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
Gutenberg Essential Blocks contains an input validation flaw that allows authenticated users with low privileges to read or modify data across the site. The vulnerability affects all versions up to 4.5.1. An attacker with a basic user account can exploit this without user interaction, potentially accessing or altering content beyond their intended scope.
What an attacker can do
03Attacker Capabilities
Read or modify site data and content beyond their normal user permissions.
Potential impact on your site
04Site Impact
Unauthorized data disclosure or modification by low-privilege users; site content integrity at risk.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege user account (e.g., subscriber or contributor role).
Key dates
06Disclosure timeline
March 13, 2024
CVE published
April 8, 2026
Record updated
