Vulnerability · Published Apr 8, 2026 · Assigned by Wordfence

CVE-2026-3296Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injection via Form Entry Metadata

Critical 9.8

In plain English

A critical-severity unsafe deserialization in Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder from wpeverest. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.6% (higher than 89% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)3.6%top 10.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling2Nuclei, Public PoC

Official 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.

Affected products (as reported)

Vendor	Product	Versions
wpeverest	Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder	0 – through 3.4.3

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

In plain English

Official description

Affected products (as reported)

References