Stored Cross-Site Scripting in Ninja Forms Plugin for WordPress
CVE-2026-109997

7.2HIGH

Key Information:

Vendor

WordPress
Status
Ninja Forms – Contact Form Builder With Calculators, Quizzes, Signatures & Ai Form Builder
Vendor
CVE Published:
31 October 2026

What is CVE-2026-109997?

The Ninja Forms plugin for WordPress is susceptible to stored cross-site scripting (XSS) attacks through the 'formData.extra' parameter. Due to the lack of proper input sanitization and output escaping, unauthenticated attackers can inject malicious web scripts that execute when users access compromised pages. Furthermore, the nf_ajax_submit endpoint's nonce validation can be bypassed, allowing an attacker to exploit the vulnerability with ease through a single unauthorized request. This exposes website users to potential security threats.

Affected Version(s)

Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder 0 <= 3.15.5

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/ninja-forms/ta...
https://plugins.trac.wordpress.org/browser/ninja-forms/ta...

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

daroo
.