CVE-2023-4386: Wpdeveloper Essential Blocks

High severity, CVSS 8.1. EPSS: 0.9% chance of exploitation in the next 30 days.

The Essential Blocks plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.2.0 via deserialization of untrusted input in the get_posts function. This allows unauthenticated attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

Affected products

• Wpdeveloper Essential Blocks: up to and including 4.2.0

Published 2023-10-20. Last modified 2026-06-17.