The Everest Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.4.3 via deserialization of untrusted input from form entry metadata. This is due to the html-admin-page-entries-view.php file calling PHP's native unserialize() on stored entry meta values without passing the allowed_classes parameter. This makes it possible for unauthenticated attackers to inject a serialized PHP object payload through any public Everest Forms form field. The payload survives sanitize_text_field() sanitization (serialization control characters are not stripped) and is stored in the wp_evf_entrymeta database table. When an administrator views entries or views an individual entry, the unsafe unserialize() call processes the stored data without class restrictions.
CVE-2026-3296 is a critical severity with CVSS 9.8 Vulnerability issue affecting the Plugin Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder. It affects Versions up to 3.4.3 and is fixed in 3.4.4.
CVE-2026-3296 is tracked for the Plugin Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder as critical severity with CVSS 9.8. The affected range is Versions up to 3.4.3. Update Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder to 3.4.4 or newer where that version is compatible with the site.
| Software Type | Plugin |
|---|---|
| Software Slug |
everest-forms
View on wordpress.org
|
| CVE | CVE-2026-3296 |
| Patched Versions |
3.4.4
|
| Affected Versions |
Versions up to 3.4.3
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
Everest Forms – Contact Form, Quiz, Survey, Newsletter & Payment Form Builder for WordPress <= 3.1.1 - Unauthenticated PHP Object Injection
Everest Forms <= 3.0.9.4 - Unauthenticated Arbitrary File Upload, Read, and Deletion
Contact Form, Drag and Drop Form Builder for WordPress – Everest Forms <= 1.4.9 - SQL Injection
Everest Forms <= 3.4.4 - Unauthenticated Arbitrary File Read and Deletion via Upload Field 'old_files' Parameter
Everest Forms <= 3.2.2 - Unauthenticated PHP Object Injection
Everest Forms <= 2.0.7 - Unauthenticated Server-Side Request Forgery via font_url
Everest Forms <= 3.1.1 - Reflected Cross-Site Scripting
Everest Forms <= 1.7.9 - Reflected Cross-Site Scripting
This record contains material that is subject to copyright
License: Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy. Read more
License: CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy. Read more
