CVE-2026-3296 Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injection via Form Entry Metadata
Unauthenticated attackers can achieve remote code execution by injecting serialized PHP objects into form entries, which are deserialized when administrators view them.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3296?
CVE-2026-3296 is a critical unsafe deserialization vulnerability in wpeverest Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder, published on 8 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-3296?
How do I fix CVE-2026-3296?
No fix has been published for CVE-2026-3296 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-3296 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3296 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-rc2g-jh8w-mqh9.