CVE-2026-4882— User Registration Advanced Fields <= 1.6.20 - Unauthenticated Arbitrary File Upload
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I. Basic Information for CVE-2026-4882
Vulnerability Information
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Vulnerability Title
User Registration Advanced Fields <= 1.6.20 - Unauthenticated Arbitrary File Upload
Source: NVD (National Vulnerability Database)
Vulnerability Description
The User Registration Advanced Fields plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'URAF_AJAX::method_upload' function in all versions up to, and including, 1.6.20. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. Note: The vulnerability can only be exploited if a "Profile Picture" field is added to the form.
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
危险类型文件的不加限制上传
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin User Registration Advanced Fields 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 User Registration Advanced Fields 1.6.20及之前版本存在代码问题漏洞，该漏洞源于URAF_AJAX::method_upload函数缺少文件类型验证，可能导致未经身份验证的攻击者
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 | User Registration Advanced Fields | 0 ~ 1.6.20 | - |
II. Public POCs for CVE-2026-4882
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same vendor: WPEverest
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WordPress User Registration plugin <= 5.1.5 - Cross Site Scr - CVE-2026-5478
Everest Forms <= 3.4.4 - Unauthenticated Arbitrary File Read - CVE-2026-6203
User Registration & Membership <= 5.1.4 - Unauthenticated Op - CVE-2026-1865
User Registration & Membership <= 5.1.2 - Authenticated (Sub
Same weakness: CWE-434
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Slider Revolution 7.0.0 - 7.0.10 - Authenticated (Subscriber - CVE-2026-41587
CI4MS: Unrestricted PHP File Upload via Theme Installation L
V. Comments for CVE-2026-4882
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