EUVD-2026-20020CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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.
Analysis
PHP object injection in Everest Forms for WordPress (all versions ≤3.4.3) allows unauthenticated remote attackers to achieve critical system compromise. Attackers submit malicious serialized payloads through any public form field, which persist through sanitization into the wp_evf_entrymeta database table. …
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Remediation
Within 24 hours: Identify all WordPress instances running Everest Forms ≤3.4.3 using plugin inventory tools; temporarily disable the plugin if upgrade cannot be completed immediately. Within 7 days: Upgrade all affected installations to Everest Forms version 3.4.4 or later. …
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