CVE-2025-15440: iONE360 WordPress Plugin XSS Vulnerability

CVE-2025-15440 Overview

The iONE360 configurator plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the Contact Form Parameters functionality. This security flaw exists in all versions up to and including 2.0.57 due to insufficient input sanitization and output escaping. The vulnerability allows unauthenticated attackers to inject arbitrary web scripts into pages, which execute whenever a user accesses an affected page.

Critical Impact

Unauthenticated attackers can inject persistent malicious scripts that execute in the context of victim users' browsers, potentially leading to session hijacking, credential theft, or malware distribution.

Affected Products

• iONE360 Configurator Plugin for WordPress versions up to and including 2.0.57
• WordPress installations using vulnerable iONE360 Configurator plugin versions
• Sites utilizing the Contact Form Parameters feature of the plugin

Discovery Timeline

• 2026-02-11 - CVE-2025-15440 published to NVD
• 2026-02-11 - Last updated in NVD database

Technical Details for CVE-2025-15440

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability (CWE-79) resides in the Contact Form administration interface of the iONE360 Configurator plugin. The vulnerable code is located in the configurator-ione360-admin-contact-form.php file within the admin partials directory. Multiple entry points exist across several lines of this file (lines 50, 53, 56, 59, 60, 63, 66, and 69), each representing a parameter that fails to properly sanitize user input before storing it in the database and subsequently displaying it in the rendered HTML output.

The attack requires no authentication, making it particularly dangerous as any visitor can potentially inject malicious payloads. Once injected, the scripts persist in the database and execute whenever an administrator or user accesses the affected page, creating a stored XSS scenario that can affect multiple victims over time.

Root Cause

The vulnerability stems from a failure to implement proper input validation and output encoding practices. The Contact Form Parameters accept user-supplied data without adequate sanitization on input, and the stored values are rendered in HTML contexts without proper escaping on output. This dual failure—missing both input sanitization and output escaping—creates the conditions for successful script injection attacks.

WordPress provides built-in functions such as sanitize_text_field(), esc_html(), and esc_attr() specifically designed to prevent XSS attacks, but the vulnerable code paths in the iONE360 Configurator plugin do not utilize these protections appropriately.

Attack Vector

An attacker can exploit this vulnerability by submitting malicious JavaScript payloads through the Contact Form Parameters. The network-based attack vector allows remote exploitation without requiring any privileges. When an administrator subsequently views the affected configuration page or when the injected content is rendered to users, the malicious script executes in their browser context.

The stored nature of this XSS means the payload persists across sessions and affects all users who access the compromised page. Attackers could leverage this to steal session cookies, redirect users to phishing sites, capture keystrokes, or perform actions on behalf of authenticated administrators.

The vulnerability affects the confidentiality and integrity of user data and sessions, though availability remains unaffected. The scope is changed, meaning the vulnerable component can impact resources beyond its security scope.

Detection Methods for CVE-2025-15440

Indicators of Compromise

• Unexpected JavaScript code present in Contact Form parameter values in the WordPress database
• Unusual script tags or event handlers stored in wp_options or related plugin tables
• Browser security alerts or Content Security Policy violations when accessing the iONE360 Configurator admin pages

Detection Strategies

• Review the configurator-ione360-admin-contact-form.php file for suspicious content or modifications
• Implement Web Application Firewall (WAF) rules to detect XSS payload patterns in form submissions
• Enable and monitor WordPress debug logging for unexpected output or errors related to the iONE360 plugin
• Use automated vulnerability scanners to identify XSS vulnerabilities in WordPress plugin interfaces

Monitoring Recommendations

• Monitor server access logs for suspicious POST requests to the iONE360 Configurator admin endpoints
• Implement Content Security Policy headers to detect and prevent inline script execution
• Configure browser-based XSS auditors and monitoring for administrative sessions
• Regularly audit database content in plugin-related tables for malicious script injections

How to Mitigate CVE-2025-15440

Immediate Actions Required

• Update the iONE360 Configurator plugin to a patched version if available from the vendor
• Review and sanitize any existing Contact Form Parameter data in the database for malicious content
• Implement a Web Application Firewall with XSS protection rules as a defense-in-depth measure
• Consider temporarily disabling the iONE360 Configurator plugin until a patch is applied

Patch Information

Organizations should monitor the official WordPress plugin repository and the Wordfence Vulnerability Report for patch announcements. The vulnerable code can be reviewed in the WordPress Plugin Repository to understand the specific locations requiring remediation.

Workarounds

• Restrict access to the WordPress admin panel to trusted IP addresses only
• Implement strict Content Security Policy headers to prevent inline script execution
• Use a WAF to filter incoming requests containing XSS payloads targeting Contact Form endpoints
• Manually sanitize stored Contact Form parameters in the database using WordPress sanitization functions

# Example: Restrict wp-admin access by IP in .htaccess
<Files wp-login.php>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
</Files>

# Add Content-Security-Policy header in .htaccess
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self';"
</IfModule>