CVE-2026-90438
Received Received - Intake

Stored XSS in Ninja Forms WordPress Plugin via RTE Field

Publication date: 2026-10-02

Last updated on: 2026-10-02

Assigner: Wordfence

Description
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.

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Meta Information

Published
2026-10-02
Last Modified
2026-10-02
Generated
2026-10-02
AI Q&A
2026-10-02
EPSS Evaluated
N/A
NVD
CVE-2026-90438
EUVD
EUVD-2026-91177

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ninja_forms ninja_forms to 3.15.4 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Ninja Forms WordPress plugin. It allows unauthenticated attackers to inject malicious scripts via Paragraph Text fields with the Rich Text Editor (RTE) enabled. The scripts execute when users access the infected pages.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using Ninja Forms versions up to 3.15.4. Check for Paragraph Text fields with Rich Text Editor enabled. Look for suspicious script injections in submitted content. Use WordPress admin panel to review form submissions and database entries for unexpected scripts.

Impact Analysis

Attackers could steal user sessions, deface websites, or redirect users to malicious sites. Users with admin access could escalate privileges. The impact depends on the site's traffic and user roles.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR (data protection) and HIPAA (health data privacy). Organizations may face fines or legal action if user data is compromised due to this flaw.

Mitigation Strategies

Immediately update Ninja Forms to the latest version beyond 3.15.4. Disable the Rich Text Editor option for Paragraph Text fields if not required. Review all form submissions for malicious scripts and remove any found. Consider using a web application firewall to block exploitation attempts.

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