CVE-2026-3891 CRITICAL

CVE-2026-3891: Pix for WooCommerce <= 1.5.0 - Unauthenticated Arbitrary File Upload

Vendor Linknacional
Product Pix for WooCommerce
Weakness CWE-434 · Unrestricted file upload
Published March 13, 2026
Last update April 8, 2026

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

The Pix for WooCommerce plugin for WordPress is vulnerable to arbitrary file uploads due to missing capability check and missing file type validation in the 'lkn_pix_for_woocommerce_c6_save_settings' function in all versions up to, and including, 1.5.0. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

Explanation of Vulnerability in Simple Terms

02Summary

Pix for WooCommerce versions 1.5.0 and earlier allow unauthenticated attackers to upload arbitrary files to the site without restriction. An attacker can upload malicious files over the network with no special privileges or user interaction required. This enables remote code execution and full site compromise.

What an attacker can do

03Attacker Capabilities

Upload arbitrary files to the site and execute malicious code without authentication.

Potential impact on your site

04Site Impact

Complete site compromise: attackers can run code, steal data, modify content, and take full control of the WooCommerce installation.

Conditions required to exploit

05Prerequisites

Network access only; no authentication, user interaction, or special privileges required.

Key dates

06Disclosure timeline

March 13, 2026 CVE published
April 8, 2026 Record updated