CVE-2025-31057: Universal Video Player XSS Vulnerability

CVE-2025-31057 Overview

CVE-2025-31057 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the Universal Video Player plugin for WordPress, specifically the elementor_widget_universal_video_player component. This vulnerability arises 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

This Reflected XSS vulnerability can allow attackers to execute arbitrary JavaScript in victims' browsers, potentially leading to session hijacking, credential theft, defacement, or malware distribution through compromised WordPress sites.

Affected Products

• Universal Video Player for WordPress versions through 1.4.0
• WordPress sites utilizing the elementor_widget_universal_video_player component
• Elementor-based page builder implementations with the Universal Video Player widget

Discovery Timeline

• 2025-06-09 - CVE-2025-31057 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-31057

Vulnerability Analysis

This vulnerability is classified as 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 Universal Video Player plugin, the elementor_widget_universal_video_player component fails to properly sanitize user input before reflecting it back to the browser. This creates an opportunity for attackers to craft malicious URLs that, when clicked by victims, execute arbitrary JavaScript code within the security context of the vulnerable WordPress site.

The vulnerability affects all versions of Universal Video Player from initial release through version 1.4.0. As a Reflected XSS attack, successful exploitation requires user interaction—typically tricking a victim into clicking a malicious link.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and output encoding within the Universal Video Player Elementor widget. The plugin processes user-controllable parameters without adequately sanitizing them before rendering the content in the browser. This oversight allows script tags or JavaScript event handlers embedded in the input to be interpreted and executed by the victim's browser.

WordPress plugins that integrate with page builders like Elementor must implement rigorous input validation at multiple layers—both when accepting user input and when outputting content to the page. The absence of proper escaping functions such as esc_html(), esc_attr(), or wp_kses() in the vulnerable code paths enables this XSS condition.

Attack Vector

The attack vector for CVE-2025-31057 is network-based, requiring no authentication on the attacker's part. An attacker constructs a malicious URL containing JavaScript payload within a vulnerable parameter of the Universal Video Player plugin. The attack flow typically follows this pattern:

1. The attacker identifies the vulnerable parameter in the Elementor video player widget
2. A crafted URL containing malicious JavaScript is created
3. The victim is socially engineered into clicking the malicious link (via phishing email, malicious website, or compromised forum post)
4. The victim's browser loads the page, and the injected script executes with the same privileges as the legitimate site
5. The malicious script can steal session cookies, capture keystrokes, redirect users, or perform actions on behalf of the authenticated user

This attack requires user interaction (victim must click the malicious link), which is reflected in the scope-changed designation of the vulnerability. Technical details regarding specific exploitation methods can be found in the Patchstack XSS Vulnerability Report.

Detection Methods for CVE-2025-31057

Indicators of Compromise

• Suspicious URL parameters containing JavaScript code fragments, event handlers (e.g., onerror, onload), or encoded script payloads directed at Universal Video Player endpoints
• Web server logs showing requests with unusual characters or encoded sequences in query strings associated with video player functionality
• User reports of unexpected browser behavior, pop-ups, or redirects when visiting pages with the Universal Video Player widget
• Browser console errors indicating blocked or executed inline scripts from user-controllable sources

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS patterns in request parameters targeting WordPress plugin endpoints
• Deploy content security policy (CSP) headers to restrict inline script execution and report violations to a monitoring endpoint
• Utilize WordPress security plugins that scan for vulnerable plugin versions and known CVEs in installed components
• Configure intrusion detection systems (IDS) to alert on URL patterns containing script injection attempts

Monitoring Recommendations

• Enable detailed access logging on web servers and monitor for anomalous request patterns containing encoded JavaScript or HTML tags
• Implement real-time alerting for CSP violation reports that may indicate XSS exploitation attempts
• Regularly audit installed WordPress plugins against vulnerability databases such as Patchstack and WPScan
• Monitor for unauthorized changes to WordPress user roles or unexpected administrative actions that could indicate post-exploitation activity

How to Mitigate CVE-2025-31057

Immediate Actions Required

• Identify all WordPress installations using the Universal Video Player plugin version 1.4.0 or earlier and prioritize them for remediation
• Consider temporarily deactivating the Universal Video Player plugin until a patched version is available if the site handles sensitive data or has high-privilege users
• Implement WAF rules to filter XSS payloads targeting the vulnerable plugin parameters as an interim protection measure
• Review web server logs for evidence of exploitation attempts and investigate any suspicious activity

Patch Information

At the time of publication, users should monitor the official WordPress plugin repository and the vendor's communications for an updated version of Universal Video Player that addresses this vulnerability. The Patchstack advisory provides additional details on the affected versions and recommended actions.

Organizations should establish a process to track vulnerability disclosures for installed WordPress plugins and apply security updates promptly when released.

Workarounds

• Deploy a Web Application Firewall with XSS filtering rules to block malicious payloads targeting the vulnerable widget
• Implement strict Content Security Policy (CSP) headers to prevent inline script execution and mitigate the impact of successful XSS attacks
• Restrict access to WordPress admin areas to trusted IP addresses to limit the potential impact of session hijacking
• Consider replacing the Universal Video Player plugin with an alternative video embedding solution until a patched version is available

# Example: Adding basic CSP headers in Apache .htaccess
# Place this in your WordPress root .htaccess file
<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>