What the vulnerability does
01Description
The Everest Forms – Contact Form, Quiz, Survey, Newsletter & Payment Form Builder for WordPress plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.1 via deserialization of untrusted input from the 'field_value' parameter. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
Explanation of Vulnerability in Simple Terms
02Summary
Everest Forms versions up to 3.1.1 contain a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code on the site. The plugin unsafely deserializes untrusted data, enabling remote code execution without authentication or user interaction. All sites running affected versions should update immediately.
What an attacker can do
03Attacker Capabilities
Run arbitrary code on the site and take complete control of it.
Potential impact on your site
04Site Impact
Complete site compromise: attackers can steal data, modify content, install malware, or delete everything.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
April 11, 2025
CVE published
April 8, 2026
Record updated
