CVE-2025-24694: CM Pop-Up Banners XSS Vulnerability

CVE-2025-24694 Overview

A Reflected Cross-Site Scripting (XSS) vulnerability has been identified in the CM Pop-Up Banners WordPress plugin developed by CreativeMindsSolutions. This vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.

Critical Impact

Attackers can exploit this Reflected XSS vulnerability to steal session cookies, redirect users to malicious sites, perform actions on behalf of authenticated users, or deliver phishing attacks against WordPress administrators and site visitors.

Affected Products

• CM Pop-Up Banners WordPress Plugin versions up to and including 1.7.6
• WordPress installations utilizing the cm-pop-up-banners plugin

Discovery Timeline

• 2025-03-03 - CVE-2025-24694 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-24694

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Reflected XSS variant occurs when user-supplied input is immediately returned by the web application in an error message, search result, or other response without proper sanitization or encoding.

In the context of the CM Pop-Up Banners plugin, the application fails to properly validate and escape user-controlled input before including it in the HTTP response. This allows an attacker to craft a malicious URL containing JavaScript code that, when clicked by a victim, executes within the security context of the vulnerable WordPress site.

The attack requires user interaction, as the victim must click on or visit a specially crafted link. However, social engineering techniques can make such attacks highly effective, particularly when targeting WordPress administrators who have elevated privileges.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and output encoding within the CM Pop-Up Banners plugin. The plugin processes user-supplied parameters without adequately sanitizing them before reflecting the content back to the user's browser. WordPress plugins should utilize functions like esc_html(), esc_attr(), and wp_kses() to properly escape output, but this security control appears to be missing or improperly implemented in the affected versions.

Attack Vector

The attack is executed through a network-based vector where an attacker constructs a malicious URL containing embedded JavaScript payload. The attack flow typically involves:

1. The attacker identifies a vulnerable parameter in the CM Pop-Up Banners plugin
2. A malicious URL is crafted containing JavaScript code within the vulnerable parameter
3. The attacker distributes this URL through phishing emails, social media, or other channels
4. When a victim clicks the link, the malicious script executes in their browser
5. The script can then steal cookies, capture keystrokes, modify page content, or perform other malicious actions

The vulnerability is particularly concerning for WordPress administrators, as successful exploitation could lead to complete site compromise through session hijacking or credential theft.

Detection Methods for CVE-2025-24694

Indicators of Compromise

• Unusual JavaScript execution in browser developer console when visiting pop-up banner pages
• Unexpected URL parameters containing script tags or JavaScript event handlers in web server access logs
• Reports from users of unexpected redirects or pop-ups when interacting with the website
• Anomalous outbound connections from visitor browsers to unknown external domains

Detection Strategies

• Review web server access logs for URL parameters containing suspicious patterns such as <script>, javascript:, onerror=, onload=, or encoded variants
• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads targeting WordPress plugins
• Deploy browser-based Content Security Policy (CSP) headers to mitigate the impact of successful XSS exploitation
• Conduct regular security scans of WordPress installations using tools that identify vulnerable plugin versions

Monitoring Recommendations

• Enable verbose logging for the CM Pop-Up Banners plugin and monitor for unusual parameter values
• Configure intrusion detection systems to alert on XSS signature patterns in HTTP traffic
• Monitor for unexpected DOM modifications using JavaScript integrity monitoring solutions
• Set up alerts for anomalous user session behavior that may indicate session hijacking

How to Mitigate CVE-2025-24694

Immediate Actions Required

• Update the CM Pop-Up Banners plugin to the latest available version that addresses this vulnerability
• If an update is not immediately available, consider temporarily deactivating the plugin until a patch is released
• Review web server logs for any signs of exploitation attempts against this vulnerability
• Implement WAF rules to block common XSS attack patterns as an additional layer of defense

Patch Information

Organizations should monitor the Patchstack Vulnerability Report for updates regarding patches and remediation guidance. Check the WordPress plugin repository for the latest version of CM Pop-Up Banners and apply updates as soon as they become available.

Workarounds

• Temporarily disable the CM Pop-Up Banners plugin if it is not business-critical until a patch is available
• Implement strict Content Security Policy (CSP) headers to prevent inline script execution
• Deploy a Web Application Firewall with XSS protection rules enabled to filter malicious requests
• Restrict access to WordPress admin areas using IP allowlisting to reduce the attack surface

# Example Apache .htaccess CSP header configuration
<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>