What the vulnerability does
01Description
The Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'titleTag' attribute in all versions up to, and including, 5.7.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, 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 versions up to 5.7.1 contain a stored cross-site scripting (XSS) vulnerability. An authenticated user with low privileges can inject malicious scripts that execute in the browsers of other site visitors, potentially compromising their accounts or stealing sensitive data. The vulnerability affects the page builder's block handling and persists across page loads.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other users' browsers when they view affected pages.
Potential impact on your site
04Site Impact
Visitors and admins viewing pages built with this plugin may have their sessions hijacked or credentials stolen.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege WordPress account (e.g., contributor or editor role).
Key dates
06Disclosure timeline
October 18, 2025
CVE published
April 8, 2026
Record updated
