CVE-2024-13803: Wpdeveloper Essential Blocks

Medium severity, CVSS 5.4. EPSS: 0.5% chance of exploitation in the next 30 days.

The Essential Blocks – Page Builder Gutenberg Blocks, Patterns & Templates plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘data-marker’ parameter in all versions up to, and including, 5.2.3 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.

Affected products

• Wpdeveloper Essential Blocks: up to and including 5.2.3

Published 2025-02-26. Last modified 2026-06-17.