XSS in Kstover Ninja Forms – Contact Form Builder With Calculators, Quizzes, Signatures & Ai

CVE-2026-90438

The Ninja Forms – The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Paragraph Text (RTE) Field Submission in all versions up to, and including, 3.15.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is only exploitable when the targeted Paragraph Text field has the Rich Text Editor (RTE) option enabled.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-90438?
CVE-2026-90438 is a high-severity vulnerability in Kstover Ninja Forms – Contact Form Builder With Calculators, Quizzes, Signatures & Ai, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-10-02.
How severe is CVE-2026-90438?
High severity. CVSS v3 base score is 7.2 out of 10.