CVE-2026-3891 Pix for WooCommerce <= 1.5.0 - Unauthenticated Arbitrary File Upload
Unauthenticated attackers can upload arbitrary files via missing validation, potentially leading to remote code execution on the server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3891?
CVE-2026-3891 is a critical vulnerability in linknacional Pix for WooCommerce, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-434
Which versions are affected by CVE-2026-3891?
How do I fix CVE-2026-3891?
No fix has been published for CVE-2026-3891 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3891 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3891 exists.
Public exploit code: 1 Metasploit module, 1 Exploit-DB entry, 1 Nuclei template and 8 proofs of concept on GitHub.
Sources
Also known as GHSA-fpj4-w3j6-3v3w.