CVE-2026-0740CWE-434

Ninja Forms - File Upload <= 3.3.26 - Unauthenticated Arbitrary File Upload

Critical · published April 7, 2026

Patch now

High probability of exploitation

CVSS calls it critical at 9.8. It sits in the 99.2th percentile for exploit probability.

CVSS v3.1

9.8

EPSS

63%

Percentile

99.2

In the wild

Unconfirmed

What it is

The Ninja Forms - File Uploads plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'NF_FU_AJAX_Controllers_Uploads::handle_upload' function in all versions up to, and including, 3.3.26. 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 was partially patched in version 3.3.25 and fully patched in version 3.3.27.

The record

Technical detail

CVSS v3.1: 9.8 · CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0: Not supplied
EPSS: 0.62903 · 99.2th percentile
Weakness: CWE-434 · Unrestricted Upload of File with Dangerous Type
Published: 2026-04-07T04:25Z

EPSS history

Timeline

07 APR 04:25Z
Ninja Forms - File Upload <= 3.3.26 - Unauthenticated Arbitrary File Upload
cvelistv5