# CVE-2026-3296: WPEverest Everest Forms PHP Object Injection in form entry metadata

Source: https://junglewise.ai/threats/cve-2026-3296-wpeverest-everest-forms-php-object-injection-in-form-entry  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-08. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-3296 · Severity: critical · CVSS 9.8 · Published 2026-04-08

Everest Forms, a popular WordPress plugin used for creating contact and payment forms, contains a critical security flaw. An attacker can submit malicious data through any public form on a website, which is then stored in the site's database. When a site administrator later views these form submissions, the malicious data is automatically processed, potentially allowing the attacker to take full control of the website or delete sensitive information.

Technologies: [WPEverest Everest Forms](https://junglewise.ai/threats/technologies/everest-forms). Vendors: [WPEverest](https://junglewise.ai/threats/vendors/wpeverest).

## Quick answers

**Is CVE-2026-3296 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-3296 being exploited in the wild.

**How severe is CVE-2026-3296?** Critical severity, with a CVSS score of 9.8, published 8 April 2026.

**Which products and versions are affected?** WPEverest Everest Forms up to, and including, 3.4.3.

**Is there a fix for CVE-2026-3296?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-3296 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-3296?** Check whether you run WPEverest Everest Forms at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Everest Forms plugin is vulnerable to PHP Object Injection via the 'unserialize()' function in the 'html-admin-page-entries-view.php' file. The vulnerability occurs because the plugin fails to use the 'allowed_classes' parameter when deserializing stored entry metadata. An unauthenticated attacker can submit a serialized PHP object through any public form field; this payload bypasses 'sanitize_text_field()' because serialization control characters are not stripped. The payload is stored in the 'wp_evf_entrymeta' table and is executed when an administrator views the entries in the WordPress dashboard. If a suitable POP chain is present on the server, this can lead to remote code execution or arbitrary file deletion. The issue is fixed in version 3.4.4.

## Affected products

- WPEverest Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder up to, and including, 3.4.3

## Timeline

- 2026-04-08: disclosed: Initial publication of the vulnerability advisory.
- 2026-04-08: advisory: Wordfence published detailed vulnerability information.

## References

- [https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.3/includes/admin/views/html-admin-page-entries-view.php](https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.3/includes/admin/views/html-admin-page-entries-view.php)
- [https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.3/includes/evf-core-functions.php](https://plugins.trac.wordpress.org/browser/everest-forms/tags/3.4.3/includes/evf-core-functions.php)
- [https://plugins.trac.wordpress.org/browser/everest-forms/trunk/includes/admin/views/html-admin-page-entries-view.php](https://plugins.trac.wordpress.org/browser/everest-forms/trunk/includes/admin/views/html-admin-page-entries-view.php)
- [https://plugins.trac.wordpress.org/changeset/3489938/everest-forms/tags/3.4.4/readme.txt?old=3464753&old_path=everest-forms%2Ftags%2F3.4.3%2Freadme.txt](https://plugins.trac.wordpress.org/changeset/3489938/everest-forms/tags/3.4.4/readme.txt?old=3464753&old_path=everest-forms%2Ftags%2F3.4.3%2Freadme.txt)
- [https://plugins.trac.wordpress.org/changeset?old_path=/everest-forms/tags/3.4.3&new_path=/everest-forms/tags/3.4.4](https://plugins.trac.wordpress.org/changeset?old_path=/everest-forms/tags/3.4.3&new_path=/everest-forms/tags/3.4.4)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/2693ae37-790d-4b18-a9ec-054c8c27b8bc?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/2693ae37-790d-4b18-a9ec-054c8c27b8bc?source=cve)

## Related threats

- [WPEverest Everest Forms missing authorization in Site Assistant REST API](https://junglewise.ai/threats/cve-2026-12270-wpeverest-everest-forms-missing-authorization-in-site-assistant)
- [Everest Forms information disclosure via residual CSV artifacts](https://junglewise.ai/threats/cve-2026-11571-everest-forms-information-disclosure-via-residual-csv-artifacts)
- [WPEverest Everest Forms unauthenticated reflected XSS](https://junglewise.ai/threats/cve-2026-57312-wpeverest-everest-forms-unauthenticated-reflected-xss)
- [WPEverest Everest Forms unauthorized email sending in send_test_email](https://junglewise.ai/threats/cve-2026-4888-wpeverest-everest-forms-unauthorized-email-sending-in-send-test)