CVE-2026-94504
Received Received - Intake

Stored XSS in Ninja Forms WordPress Plugin

Publication date: 2026-09-22

Last updated on: 2026-09-22

Assigner: Wordfence

Description
Ninja Forms 3.15.3 stores an anonymous non-RTE textarea value and renders it without safe HTML encoding in the legacy submission editor. An attacker can break out of the textarea with stored script. When an Administrator opens the attacker-known direct submission URL, the script runs in the WordPress admin origin.

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Meta Information

Published
2026-09-22
Last Modified
2026-09-22
Generated
2026-09-22
AI Q&A
2026-09-22
EPSS Evaluated
N/A
NVD
CVE-2026-94504
EUVD
EUVD-2026-84281

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ninja_forms ninja_forms 3.15.3

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

Ninja Forms 3.15.3 has a stored cross-site scripting (XSS) vulnerability. It stores user input in a textarea without proper HTML encoding. When an administrator views the submission in the legacy editor, malicious script can execute in the WordPress admin area.

Detection Guidance

Check if Ninja Forms 3.15.3 is installed on your WordPress site. Inspect submissions for stored scripts in textarea fields. Review admin access logs for unusual activity after submission URLs are accessed.

Impact Analysis

An attacker could inject malicious scripts into the Ninja Forms submission. When an admin accesses the submission, the script runs in their browser with admin privileges. This could lead to session hijacking, data theft, or unauthorized actions in WordPress.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR (data protection) and HIPAA (health data privacy). It may result in non-compliance due to potential data breaches or unauthorized processing of personal information.

Mitigation Strategies

Update Ninja Forms to the latest version. Remove or sanitize any malicious scripts in stored submissions. Restrict admin access to trusted users only.

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