CVE-2026-3296
Published April 8, 2026 · Updated April 8, 2026
What This Means
CVE-2026-3296 is a critical PHP Object Injection vulnerability affecting the Everest Forms plugin for WordPress, present in all versions up to 3.4.3. This flaw allows unauthenticated attackers to inject malicious serialized PHP objects via public form fields, which get stored in the database and processed unsafely when an administrator views the entries. To mitigate this risk, update the Everest Forms plugin to the latest version immediately and review access controls for form submissions to limit exposure.
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.
Recommended Actions
- Check if your systems use any of the affected products listed above.
- Apply vendor patches immediately if available.
- Monitor vendor advisories for updates and additional mitigations.
- Review logs for indicators of compromise related to CVE-2026-3296.