What the vulnerability does
01Description
The Everest Forms Pro plugin for WordPress is vulnerable to Remote Code Execution via PHP Code Injection in all versions up to, and including, 1.9.12. This is due to the Calculation Addon's process_filter() function concatenating user-submitted form field values into a PHP code string without proper escaping before passing it to eval(). The sanitize_text_field() function applied to input does not escape single quotes or other PHP code context characters. This makes it possible for unauthenticated attackers to inject and execute arbitrary PHP code on the server by submitting a crafted value in any string-type form field (text, email, URL, select, radio) when a form uses the "Complex Calculation" feature.
Explanation of Vulnerability in Simple Terms
02Summary
Everest Forms Pro versions up to 1.9.12 contain a code injection vulnerability that allows unauthenticated attackers to run arbitrary PHP code on the site without user interaction. The vulnerability exists in how the plugin processes user input, enabling remote code execution. All sites running affected versions should update immediately.
What an attacker can do
03Attacker Capabilities
Run arbitrary PHP code on the site and take complete control of it.
Potential impact on your site
04Site Impact
Complete compromise of the site, including data theft, malware installation, and defacement.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
March 31, 2026
CVE published
April 8, 2026
Record updated
