CVE-2026-4883
CRITICALPiotnet Forms <= 2.1.40 - Unauthenticated Arbitrary File Upload via Form File Upload
Title source: cnaExploitation Summary
EIP tracks 1 public exploit for CVE-2026-4883. PoCs published by xShadow-Here.
AI-analyzed exploit summary This repository contains a functional exploit for CVE-2026-4883, an unauthenticated arbitrary file upload vulnerability in Piotnet Forms Pro <= 2.1.40. The exploit leverages an incomplete extension blacklist to upload a malicious PHP shell (e.g., .phtml) and achieve remote code execution (RCE).
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.
Exploits (1)
This repository contains a functional exploit for CVE-2026-4883, an unauthenticated arbitrary file upload vulnerability in Piotnet Forms Pro <= 2.1.40. The exploit leverages an incomplete extension blacklist to upload a malicious PHP shell (e.g., .phtml) and achieve remote code execution (RCE).
References (2)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H