CVE-2026-3296criticalobserved exploitationCWE-502

CVE-2026-3296: critical vulnerability in wpeverest Everest Forms – Contact Form…

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

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85Vexday Risk Score

Patch now. It exploitation observed by VulnCheck and has a working public exploit.

ssvc Actcvss 9.8epss 3.6%
from disclosure to weapon48 days
Published on NVDApr 8
1st PoC+48d
VulnCheck+26d
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
wpeverest · Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder
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