CVE-2026-15161
Received Received - Intake

Stored XSS in Ninja Forms Excel Export WordPress Plugin

Publication date: 2026-07-17

Last updated on: 2026-07-17

Assigner: Wordfence

Description
The Ninja Forms - Excel Export plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.3.6. This is due to the save_filter() AJAX handler storing the raw $_POST['filter'] array into a WordPress option via update_option() without any capability check, nonce verification, or input sanitization, combined with the get_filter_row() method on the admin Excel Export screen concatenating the stored filter values (field_key, condition, value) directly into HTML attributes without esc_attr(). This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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Meta Information

Published
2026-07-17
Last Modified
2026-07-17
Generated
2026-07-17
AI Q&A
2026-07-17
EPSS Evaluated
N/A
NVD
CVE-2026-15161
EUVD
EUVD-2026-45136

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ninja_forms excel_export to 3.3.6 (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 vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Ninja Forms - Excel Export WordPress plugin. It allows authenticated attackers with subscriber-level access or higher to inject malicious scripts into web pages. The issue occurs because the plugin stores user-supplied input without proper sanitization or security checks, and later renders it unsafely in HTML attributes.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using the Ninja Forms - Excel Export plugin version 3.3.6 or lower. Check for unauthorized stored XSS payloads in WordPress options or admin pages. Review server logs for suspicious AJAX requests to save_filter(). Use commands like grep -r 'save_filter' /var/www/ to search for plugin files.

Impact Analysis

If exploited, this vulnerability could allow attackers to steal sensitive user data, hijack user sessions, or perform actions on behalf of users. It may also deface websites or redirect users to malicious sites. The impact depends on the attacker's goals and the site's user base.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA by enabling unauthorized access to personal or health data. If exploited, it may result in data breaches, violating privacy requirements and potentially leading to legal penalties or reputational damage.

Mitigation Strategies

Immediately update the Ninja Forms - Excel Export plugin to the latest version. Remove or disable the plugin if updates are unavailable. Restrict subscriber-level access to sensitive admin functions. Review WordPress options for injected scripts in the filter settings.

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