CVE-2021-34648

Ninja Forms <= 3.5.7 Unprotected REST-API to Email Injection

MEDIUM
4.3
CVSS Score
Published: September 22, 2021 at 05:53 PM UTC
Updated: June 17, 2026 at 03:56 AM UTC
1 product affected across 1 vendorNinjaforms

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ninjaforms· Ninjaformswordpress-plugin
95%
v ≤ 3.5.73.5.7

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863CWE-862

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