CVE-2026-3296: CWE-502 Deserialization of Untrusted Data in wpeverest Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder
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.
AI Analysis
Technical Summary
CVE-2026-3296 is a critical vulnerability in the Everest Forms plugin for WordPress, affecting all versions up to 3.4.3. The issue arises from the html-admin-page-entries-view.php file calling PHP's native unserialize() function on stored entry metadata without restricting allowed classes. Attackers can inject serialized PHP objects via public form fields, bypassing sanitize_text_field() sanitization, and these payloads are stored in the wp_evf_entrymeta database table. When an administrator views form entries, the unsafe unserialize() call processes the malicious payload, enabling PHP Object Injection. The vulnerability has a CVSS v3.1 score of 9.8, indicating critical severity. No patch or official remediation level has been published yet.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary PHP code or perform other malicious actions with the privileges of the WordPress administrator when viewing form entries. This can lead to full site compromise, data theft, or service disruption. The vulnerability affects confidentiality, integrity, and availability (all rated high).
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the WordPress admin panel to trusted users only and consider disabling or limiting use of the Everest Forms plugin. Monitor vendor channels for updates and apply official patches immediately once released.
CVE-2026-3296: CWE-502 Deserialization of Untrusted Data in wpeverest Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-3296 is a critical vulnerability in the Everest Forms plugin for WordPress, affecting all versions up to 3.4.3. The issue arises from the html-admin-page-entries-view.php file calling PHP's native unserialize() function on stored entry metadata without restricting allowed classes. Attackers can inject serialized PHP objects via public form fields, bypassing sanitize_text_field() sanitization, and these payloads are stored in the wp_evf_entrymeta database table. When an administrator views form entries, the unsafe unserialize() call processes the malicious payload, enabling PHP Object Injection. The vulnerability has a CVSS v3.1 score of 9.8, indicating critical severity. No patch or official remediation level has been published yet.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary PHP code or perform other malicious actions with the privileges of the WordPress administrator when viewing form entries. This can lead to full site compromise, data theft, or service disruption. The vulnerability affects confidentiality, integrity, and availability (all rated high).
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the WordPress admin panel to trusted users only and consider disabling or limiting use of the Everest Forms plugin. Monitor vendor channels for updates and apply official patches immediately once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-02-26T20:09:26.417Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d5da2d43e2781badfbe6a8
Added to database: 4/8/2026, 4:31:41 AM
Last enriched: 4/8/2026, 4:46:36 AM
Last updated: 4/8/2026, 6:55:24 AM
Views: 4
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