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Critical Severity Vulnerability

This vulnerability has been rated as Critical severity. Immediate action is recommended.

CVE-2026-3296

Critical

Low Medium High Critical

9.8

CVSS Score

Published: Apr 08, 2026

Last Modified: Apr 08, 2026

CWE: CWE-502

Vulnerability Description

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.

CVSS Metrics

Common Vulnerability Scoring System

Vector String:

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

References & Resources

Severity Details

9.8

out of 10.0

Critical

Weakness Type (CWE)

CWE-502 Top 25 #15

Deserialization of Untrusted Data

Description: The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Exploit Likelihood: Medium
Typical Severity: Medium
OWASP Top 10: A08:2021-Software/Data Integrity Failures
Abstraction Level: Base