CVE-2025-23885: MJ Contact Us Plugin XSS Vulnerability

CVE-2025-23885 Overview

CVE-2025-23885 is an Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) vulnerability affecting the MJ Contact us WordPress plugin developed by anildhiman. This Reflected XSS vulnerability allows attackers to inject malicious scripts that execute in the context of a victim's browser session when they visit a specially crafted URL.

Critical Impact

Attackers can exploit this Reflected XSS vulnerability to steal session cookies, redirect users to malicious websites, deface web content, or perform actions on behalf of authenticated users without their consent.

Affected Products

• MJ Contact us WordPress plugin version 5.2.3 and earlier
• WordPress sites with vulnerable MJ Contact us (mj-contact-us) plugin installed

Discovery Timeline

• 2025-01-24 - CVE CVE-2025-23885 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23885

Vulnerability Analysis

This vulnerability stems from improper input validation and output encoding within the MJ Contact us WordPress plugin. The plugin fails to properly sanitize user-supplied input before reflecting it back in the HTTP response, enabling Reflected Cross-Site Scripting (XSS) attacks. This type of vulnerability (CWE-79) occurs when an application includes unvalidated and unescaped user input as part of HTML output.

The attack requires user interaction, as victims must click on a malicious link containing the XSS payload. However, once executed, the malicious script runs with the same privileges as the victim's session, potentially compromising sensitive data or enabling further attacks against the WordPress installation.

Root Cause

The root cause of this vulnerability is the failure to implement proper input sanitization and output encoding mechanisms within the MJ Contact us plugin. When processing user input through web forms or URL parameters, the plugin does not adequately neutralize special characters that could be interpreted as HTML or JavaScript code. This allows attackers to inject executable scripts that bypass the browser's same-origin policy by appearing to originate from the trusted WordPress domain.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker crafts a malicious URL containing JavaScript code embedded in vulnerable parameters. This URL is then distributed to potential victims through phishing emails, social media, or other channels. When a victim clicks the link and visits the vulnerable WordPress site, the malicious script executes in their browser context.

The vulnerability allows an attacker to potentially access session tokens, perform unauthorized actions, modify page content, or redirect users to malicious external sites. Since the script executes in the context of the legitimate WordPress domain, it can access cookies and other sensitive data associated with that origin.

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-23885

Indicators of Compromise

• Unusual JavaScript content appearing in server access logs within URL parameters targeting MJ Contact us plugin endpoints
• User reports of unexpected browser behavior or redirects when interacting with contact forms
• Detection of HTML-encoded payloads such as <script>, javascript:, or event handlers in request parameters
• Suspicious outbound connections originating from user sessions after visiting WordPress pages with contact forms

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads in HTTP requests
• Monitor server access logs for requests containing encoded script tags or event handler attributes targeting the mj-contact-us plugin paths
• Deploy browser-based Content Security Policy (CSP) headers to restrict inline script execution and report violations
• Use automated vulnerability scanners to periodically test WordPress installations for XSS vulnerabilities

Monitoring Recommendations

• Enable detailed logging for all WordPress plugin endpoints, particularly form submission handlers
• Configure SIEM alerts for patterns matching XSS attack signatures in web server logs
• Monitor for anomalous user session behavior that may indicate successful XSS exploitation
• Regularly audit installed WordPress plugins against vulnerability databases like Patchstack

How to Mitigate CVE-2025-23885

Immediate Actions Required

• Update the MJ Contact us plugin to a patched version as soon as one becomes available from the developer
• Consider temporarily deactivating the mj-contact-us plugin until a security patch is released
• Implement strict Content Security Policy (CSP) headers to mitigate XSS impact
• Deploy a Web Application Firewall (WAF) with XSS protection rules enabled

Patch Information

At the time of publication, users should monitor the WordPress plugin repository and the Patchstack advisory for patch availability. Organizations should update to a version newer than 5.2.3 when released by the plugin developer.

Workarounds

• Temporarily disable the MJ Contact us plugin until a patch is available
• Implement server-side input validation to filter potentially malicious characters from user input
• Configure HTTP response headers including Content-Security-Policy to restrict inline script execution
• Use a Web Application Firewall to filter XSS payloads before they reach the WordPress application

# WordPress .htaccess CSP configuration example
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
</IfModule>