CVE-2023-4402: Wpdeveloper Essential Blocks

Critical severity, CVSS 9.8. EPSS: 1.5% 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_products 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: before 4.2.1 (fixed in 4.2.1)
• Wpdeveloper Essential Blocks Pro: before 1.1.1 (fixed in 1.1.1)

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