CVE-2025-48170: WPBakery Video Player XSS Vulnerability

CVE-2025-48170 Overview

CVE-2025-48170 is a Cross-Site Scripting (XSS) vulnerability affecting the Universal Video Player - Addon for WPBakery Page Builder WordPress plugin developed by LambertGroup. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.

This Reflected XSS vulnerability enables attackers to craft malicious URLs that, when clicked by authenticated users or site visitors, execute arbitrary JavaScript code. This can lead to session hijacking, credential theft, defacement, or redirection to malicious sites.

Critical Impact

Attackers can exploit this vulnerability to steal session cookies, hijack user accounts, perform actions on behalf of authenticated users, or distribute malware through trusted WordPress sites.

Affected Products

• Universal Video Player - Addon for WPBakery Page Builder versions through 3.2.1
• WordPress sites using the lbg-universal-video-player-addon-visual-composer plugin
• WPBakery Page Builder environments with the affected addon installed

Discovery Timeline

• 2025-08-20 - CVE-2025-48170 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-48170

Vulnerability Analysis

The Universal Video Player addon for WPBakery Page Builder contains a Reflected Cross-Site Scripting vulnerability classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). The vulnerability exists because the plugin fails to properly sanitize or encode user-controlled input before reflecting it back in HTTP responses.

Reflected XSS attacks occur when malicious scripts are injected via URL parameters, form inputs, or other request data that the application immediately reflects back to the user's browser without proper sanitization. In this case, the video player addon processes certain input values and includes them in the page output without adequate escaping, allowing JavaScript code execution.

Root Cause

The root cause of CVE-2025-48170 is insufficient input validation and output encoding within the Universal Video Player addon. The plugin fails to implement proper sanitization functions such as esc_attr(), esc_html(), or wp_kses() that WordPress provides for securing user input. When user-controlled data is rendered in HTML context without escaping, browsers interpret injected script tags or event handlers as legitimate code.

Attack Vector

The attack vector for this Reflected XSS vulnerability requires user interaction. An attacker crafts a malicious URL containing JavaScript payload within vulnerable parameters and distributes it via phishing emails, social media, or compromised websites. When a victim clicks the link while authenticated to the WordPress site, the malicious script executes with the victim's session privileges.

The vulnerability affects the video player functionality, meaning attack payloads could be embedded in parameters related to video URLs, player configuration options, or display settings that the addon processes and reflects in page output. For detailed technical information, refer to the Patchstack vulnerability report.

Detection Methods for CVE-2025-48170

Indicators of Compromise

• Suspicious URL patterns containing JavaScript code, <script> tags, or event handlers (e.g., onerror=, onload=) in video player parameters
• User reports of unexpected browser behavior or redirects when visiting pages with embedded video players
• Web server logs showing requests with encoded script payloads targeting video player endpoints
• Unusual cookie exfiltration attempts to external domains in network traffic

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common XSS patterns in request parameters
• Implement Content Security Policy (CSP) headers to restrict inline script execution and report violations
• Monitor browser console errors and CSP violation reports for script injection attempts
• Conduct regular security scans using WordPress security plugins that identify XSS vulnerabilities

Monitoring Recommendations

• Enable verbose logging for the WPBakery Page Builder and associated addons to capture suspicious parameter values
• Set up alerts for HTTP requests containing encoded characters commonly used in XSS payloads (%3Cscript, %22onclick, javascript:)
• Review access logs for repeated requests to video player pages with varying query parameters
• Monitor for unauthorized changes to user sessions or unexpected administrative actions following link clicks

How to Mitigate CVE-2025-48170

Immediate Actions Required

• Update the Universal Video Player - Addon for WPBakery Page Builder to a patched version if available from LambertGroup
• Temporarily disable the lbg-universal-video-player-addon-visual-composer plugin until a security patch is confirmed
• Implement strict Content Security Policy headers to prevent inline script execution
• Educate users about phishing risks and avoiding suspicious links to the WordPress site

Patch Information

Organizations should check for security updates from LambertGroup for the Universal Video Player addon. Monitor the Patchstack vulnerability database for patch availability and updated version information. Until a patch is available, consider alternative video embedding solutions that have been security-audited.

Workarounds

• Disable the affected plugin entirely if video embedding functionality is not critical to site operations
• Implement server-side input validation using WordPress sanitization functions in a custom wrapper
• Deploy a WAF rule to filter requests containing script tags or JavaScript event handlers targeting video player endpoints
• Restrict access to pages using the video player addon to authenticated and trusted users only

# WordPress configuration - Add to wp-config.php or .htaccess
# Implement basic CSP headers to mitigate XSS impact

# Apache .htaccess example
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none';"
Header set X-XSS-Protection "1; mode=block"
Header set X-Content-Type-Options "nosniff"