Is CVE-2021-34648 actively exploited?

Yes. CVE-2021-34648 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-34648 be exploited remotely?

The attack vector of CVE-2021-34648 has not been classified yet.

What is the CVSS score of CVE-2021-34648?

CVE-2021-34648 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-34648

UNKNOWNCISA KEVIN THE WILD

CVE-2021-34648

Published: April 11, 2026

EPSS:0.22%probability of exploitation in 30 daysPercentile:44.5th

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-34648 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-34648 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.