What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
Essential Blocks Pro versions up to 1.1.0 contain a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code on the site. The vulnerability exists in how the plugin processes untrusted serialized data without proper validation. An attacker can exploit this remotely without user interaction to gain full control of the WordPress installation.
What an attacker can do
03Attacker Capabilities
Run arbitrary code on the site and take full control of the WordPress installation.
Potential impact on your site
04Site Impact
Complete compromise of the WordPress site, including data theft, malware injection, and site defacement.
Conditions required to exploit
05Prerequisites
Network access to the site; no authentication or user interaction required.
Key dates
06Disclosure timeline
October 20, 2023
CVE published
April 8, 2026
Record updated
