CVE-2026-15748: Wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder

Critical severity, CVSS 9.8. EPSS: 6.1% chance of exploitation in the next 30 days.

The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

Affected products

• Wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder: up to and including 1.56.1

Published 2026-08-18. Last modified 2026-08-20.