CVE-2026-3296— Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injection via Form Entry Metadata
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I. Basic Information for CVE-2026-3296
Vulnerability Information
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Vulnerability Title
Everest Forms <= 3.4.3 - Unauthenticated PHP Object Injection via Form Entry Metadata
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
可信数据的反序列化
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin Everest Forms 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Everest Forms 3.4.3及之前版本存在代码问题漏洞，该漏洞源于对来自表单条目元数据的不可信输入进行反序列化，可能导致未经身份验证的攻击者注入序列化的PHP对象有效载荷，从而引发PHP对象注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| wpeverest | Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder | 0 ~ 3.4.3 | - |
II. Public POCs for CVE-2026-3296
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Everest Forms <= 3.1.1 - Reflected Cross-Site Scripting - CVE-2025-3439
Everest Forms – Contact Form, Quiz, Survey, Newsletter & Pay - CVE-2025-3422
Everest Forms <= 3.1.1 - Authenticated (Subscriber+) Arbitra - CVE-2025-1128
Everest Forms <= 3.0.9.4 - Unauthenticated Arbitrary File Up
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Same weakness: CWE-502
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V. Comments for CVE-2026-3296
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