CVE-2025-3439CWE-502

Everest Forms – Contact Form, Quiz, Survey, Newsletter & Payment Form Builder for WordPress <= 3.1.1 - Unauthenticated PHP Object Injection

Critical · published April 11, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
67.8
In the wild
Unconfirmed
What it is

🚨 A sneaky PHP Object Injection vulnerability lurks in Everest Forms for WordPress, affecting all versions up to 3.1.1! 🔥 Think of it like a restaurant that accepts orders without verifying the details—anyone can sneak in a request to cook something dangerous. In this case, the 'field_value' parameter is that unchecked order, waiting to be exploited if the right conditions are met. This vulnerability could allow an unauthenticated attacker to inject a PHP object, creating a door for potentially catastrophic actions! If your site has any plugins or themes with a predetermined object reuse (POP) chain, the attacker could delete files, steal sensitive data, or even execute malicious code. Yikes!

Put simply

Think of it like a restaurant that accepts orders without verifying the details—anyone can sneak in a request to cook something dangerous. In this case, the 'field_value' parameter is that unchecked order, waiting to be exploited if the right conditions are met. The Everest Forms plugin is vulnerable to PHP Object Injection through the deserialization of untrusted input from the 'field_value' parameter, making it possible for attackers to manipulate PHP objects if a vulnerable chain is present in other plugins or themes.

What to do

This vulnerability could allow an unauthenticated attacker to inject a PHP object, creating a door for potentially catastrophic actions! If your site has any plugins or themes with a predetermined object reuse (POP) chain, the attacker could delete files, steal sensitive data, or even execute malicious code. Yikes! Update Everest Forms immediately to version 3.1.2 or later to close this critical security hole. Regularly audit your installed plugins and themes for any potential POP chains that might amplify this vulnerability. Staying proactive is key! You’ve got this! With these simple steps, you can safeguard your site and earn your security hero cape! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01192 · 67.8th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2025-04-11T12:42Z
EPSS history
Timeline
  • 11 APR 12:42Z
    Everest Forms – Contact Form, Quiz, Survey, Newsletter & Payment Form Builder for WordPress <= 3.1.1 - Unauthenticated PHP Object Injection
    cvelistv5