CVE-2021-34648: Ninjaforms Ninja Forms

Medium severity, CVSS 4.3. EPSS: 0.7% chance of exploitation in the next 30 days.

The Ninja Forms WordPress plugin is vulnerable to arbitrary email sending via the trigger_email_action function found in the ~/includes/Routes/Submissions.php file, in versions up to and including 3.5.7. This allows authenticated attackers to send arbitrary emails from the affected server via the /ninja-forms-submissions/email-action REST API which can be used to socially engineer victims.

Affected products

• Ninjaforms Ninja Forms: up to and including 3.5.7

Published 2021-09-22. Last modified 2026-06-17.