CVE-2021-34648

MEDIUM EXPLOITED

Ninja Forms <= 3.5.7 - Authenticated Arbitrary Email Sending via trigger_email_action

Title source: llm

Exploitation Summary

CVE-2021-34648 has been observed exploited in the wild (reported by VulnCheck KEV).

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.

References (2)

Core 2

Core References

Exploit, Third Party Advisory x_refsource_misc

https://www.wordfence.com/blog/2021/09/recently-patched-vulnerabilities-in-ninja-forms-plugin-affects-over-1-million-site-owners/

Patch, Third Party Advisory x_refsource_misc

https://plugins.trac.wordpress.org/browser/ninja-forms/trunk/includes/Routes/Submissions.php?rev=2543837#L155

Scores

CVSS v3 6.4

EPSS 0.0064

EPSS Percentile 45.9%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

VulnCheck KEV 2021-09-22

CWE

CWE-862 CWE-863

Status published

Products (1)

ninjaforms/ninja_forms < 3.5.7

Published Sep 22, 2021

Tracked Since Feb 18, 2026