CVE-2026-1307: Ninja Forms Information Disclosure Flaw

CVE-2026-1307 Overview

The Ninja Forms - The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 3.14.1 via a callback function for the admin_enqueue_scripts action handler in blocks/bootstrap.php. This vulnerability makes it possible for authenticated attackers, with Contributor-level access and above, to gain access to an authorization token to view form submissions for arbitrary forms, which could potentially contain sensitive information.

Critical Impact

Authenticated attackers with Contributor-level privileges can access authorization tokens and view form submissions across arbitrary forms, potentially exposing sensitive user data such as personal information, contact details, and other confidential form submissions.

Affected Products

• Ninja Forms WordPress Plugin versions up to and including 3.14.1
• WordPress sites using vulnerable Ninja Forms installations
• Any forms created with the affected plugin versions

Discovery Timeline

• 2026-03-28 - CVE CVE-2026-1307 published to NVD
• 2026-03-30 - Last updated in NVD database

Technical Details for CVE-2026-1307

Vulnerability Analysis

This vulnerability is classified as CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The core issue resides in improper access control within the blocks/bootstrap.php file, where the callback function for the admin_enqueue_scripts action handler fails to properly validate user permissions before exposing authorization tokens.

The vulnerability allows authenticated users with relatively low privileges (Contributor-level) to bypass intended access restrictions and obtain tokens that should only be available to administrators or users with form management permissions. This authorization token can then be leveraged to retrieve form submission data from any form on the WordPress installation.

Root Cause

The root cause of this vulnerability lies in insufficient privilege verification within the admin_enqueue_scripts action handler callback. The affected code exposes authorization tokens to all authenticated users who can access the WordPress admin area, regardless of whether they should have access to form submission data. The blocks/bootstrap.php file fails to implement proper capability checks before including sensitive token information in the page context.

Attack Vector

The attack is network-based and requires low privileges (Contributor-level access) to execute. An attacker must first obtain valid WordPress credentials with at least Contributor-level permissions. Once authenticated, the attacker can access the administrative interface where the vulnerable script exposes the authorization token. Using this token, the attacker can craft requests to retrieve form submission data from any form managed by Ninja Forms.

The exploitation flow involves:

1. Authenticating to WordPress with Contributor-level credentials
2. Navigating to an admin page where admin_enqueue_scripts is triggered
3. Extracting the exposed authorization token from the page source or JavaScript context
4. Using the token to make API requests to retrieve form submissions

For technical details on the vulnerability and patch, refer to the WordPress Ninja Forms Changeset and the Wordfence Vulnerability Report.

Detection Methods for CVE-2026-1307

Indicators of Compromise

• Unusual API requests to Ninja Forms submission endpoints from Contributor-level user accounts
• Access to form submission data by users without form management permissions
• Elevated activity in the WordPress admin area by low-privilege accounts
• Audit log entries showing submission views by unauthorized users

Detection Strategies

• Monitor WordPress admin activity logs for Contributor-level users accessing form-related functionality
• Implement file integrity monitoring on blocks/bootstrap.php to detect unauthorized modifications
• Review API access patterns for anomalous form submission retrieval requests
• Deploy web application firewalls with rules to detect token exfiltration patterns

Monitoring Recommendations

• Enable detailed WordPress audit logging to track admin area access by user role
• Configure alerts for form submission API access from users without appropriate permissions
• Monitor outbound data transfers that may indicate bulk form data exfiltration
• Implement real-time monitoring of JavaScript context exposure in admin pages

How to Mitigate CVE-2026-1307

Immediate Actions Required

• Update Ninja Forms to the latest patched version immediately
• Audit recent form submission access logs to identify potential unauthorized access
• Review and restrict Contributor-level user accounts on affected WordPress installations
• Regenerate or rotate any authorization tokens that may have been exposed

Patch Information

The vulnerability has been addressed in the official plugin update. The fix can be reviewed in the WordPress Ninja Forms Changeset. Administrators should update the Ninja Forms plugin through the WordPress admin panel or by downloading the latest version from the WordPress plugin repository. After updating, verify the plugin version is greater than 3.14.1 to ensure the vulnerability is patched.

Workarounds

• Temporarily restrict Contributor-level access to the WordPress admin area until patching is complete
• Implement additional access controls at the server level to limit admin area access by user role
• Consider temporarily disabling the Ninja Forms plugin if sensitive data is at risk and immediate patching is not possible
• Deploy web application firewall rules to block suspicious API requests to form submission endpoints

# Configuration example
# Verify Ninja Forms version after update
wp plugin list --name=ninja-forms --fields=name,version,status

# Check for vulnerable version and update
wp plugin update ninja-forms

# Audit recent form submissions access (if WP-CLI audit plugin installed)
wp audit log --action=form_submission_view --date_after=2026-03-01