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

9.8
Deserialization of Untrusted Data
CVE CVE-2025-3439
CVSS 9.8 (Critical)
Publicly Published April 10, 2025
Last Updated April 11, 2025
Researcher kuaile

Description

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.

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Vulnerability Details for Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI

Software Type Plugin
Software Slug everest-forms (view on wordpress.org)
Patched? Yes
Remediation Update to version 3.1.2, or a newer patched version
Affected Version
  • <= 3.1.1
Patched Version
  • 3.1.2

Recent vulnerabilities in Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI

# Title CVE ID CVSS Researchers Date
1 Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI <= 3.6.1 - Reflected Cross-Site Scripting CVE-2026-94670 6.1 neurotx October 2, 2026
2 Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI <= 3.6.0 - Unauthenticated PHP Object Injection CVE-2026-62103 8.1 LueRader September 11, 2026
3 Everest Forms <= 3.4.4 - Unauthenticated Server-Side Request Forgery via Upload Field 'Previous Value' CVE-2026-5096 5.3 h0xilo August 27, 2026
4 Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI <= 3.5.2 - Missing Authorization to Authenticated (Delegated+) Arbitrary Plugin Activation via REST API and AJAX Endpoints CVE-2026-13167 4.3 skyv3il August 15, 2026
5 Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI <= 3.4.8 - Reflected Cross-Site Scripting CVE-2026-57312 6.1 bekitousei June 25, 2026
6 Everest Forms <= 3.4.0 - Unauthenticated Missing Authorization CVE-2026-12270 5.3 Pedro Pinho June 18, 2026
7 Everest Forms <= 3.4.0 - Unauthenticated Information Exposure CVE-2026-11571 5.3 Duy Tran June 18, 2026
8 Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder <= 3.4.7 - Missing Authorization to Authenticated (Subscriber+) Email Sending CVE-2026-4888 4.3 Quốc Huy (jtwings) May 27, 2026
9 Everest Forms <= 3.4.4 - Unauthenticated Arbitrary File Read and Deletion via Upload Field 'old_files' Parameter CVE-2026-5478 8.1 Bao Le April 20, 2026
10 Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injection via Form Entry Metadata CVE-2026-3296 9.8 0xsabre April 7, 2026

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