Vulnerability Description
The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to Reflected DOM-Based Cross-Site Scripting via 'querystring:<key>' URL Parameter in all versions up to, and including, 3.15.5 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. This bypass is triggered when an attacker supplies a matching field:<key> URL parameter that causes the server to fully resolve the {field:*} placeholder, forcing the client-side else-branch to abandon the server-sanitized value and reconstruct field content from the raw query string.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/assets/js/min
- https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Merg
- https://plugins.trac.wordpress.org/browser/ninja-forms/tags/3.15.4/includes/Temp
- https://plugins.trac.wordpress.org/changeset/3749135/ninja-forms/trunk/assets/js
- https://wordpress.org/plugins/ninja-forms/
- https://www.wordfence.com/threat-intel/vulnerabilities/id/82ace2e3-1120-4be9-a7c
FAQ
What is CVE-2026-100151?
CVE-2026-100151 is a vulnerability with a CVSS score of 6.1 (MEDIUM). The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to Reflected DOM-Based Cross-Site Scripting via 'querystring:<key>' UR...
How severe is CVE-2026-100151?
CVE-2026-100151 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-100151?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.