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CVE-2026-4883— Piotnet Forms <= 2.1.40 - Unauthenticated Arbitrary File Upload via Form File Upload

Quick assessment

Affected
Piotnet Piotnet Forms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 Piotnet Forms 2.1.40及之前版本存在代码问题漏洞，该漏洞源于piotnetforms_ajax_form_builder函数中文件类型验证缺失，允许未经验证的攻击者上传任意文件，可能导致远程代码执行

CVSS 9.8 · Critical EPSS 0.87% · P57

Affected Version Matrix 1

VendorProduct Version RangeStatus
Piotnet Piotnet Forms ≤ 2.1.40 affected
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I. Basic Information for CVE-2026-4883

Vulnerability Information
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Vulnerability Title
Piotnet Forms <= 2.1.40 - Unauthenticated Arbitrary File Upload via Form File Upload
Source: CVE Program / CVE List V5
Vulnerability Description
The Piotnet Forms plugin for WordPress is vulnerable to arbitrary file upload due to missing file type validation in the 'piotnetforms_ajax_form_builder' function in all versions up to, and including, 2.1.40. The plugin uses an incomplete extension blacklist that only blocks php, phpt, php5, php7, and exe extensions, while allowing dangerous extensions such as .phar or .phtml to be uploaded. 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 exploit can only be exploited if a file field is added to the form.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Piotnet 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 Piotnet Forms 2.1.40及之前版本存在代码问题漏洞，该漏洞源于piotnetforms_ajax_form_builder函数中文件类型验证缺失，允许未经验证的攻击者上传任意文件，可能导致远程代码执行
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Piotnet Piotnet Forms 0 ~ 2.1.40 -

II. Public POCs for CVE-2026-4883

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III. Intelligence Information for CVE-2026-4883

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Vendor Advisories for CVE-2026-4883 (1)

Vendor Pages for CVE-2026-4883 (1)

IV. Related Vulnerabilities

Same product: Piotnet Forms
Same vendor: Piotnet
Same weakness: CWE-434

V. Comments for CVE-2026-4883

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