CVE-2025-14557: Drupal Facebook Pixel XSS Vulnerability

CVE-2025-14557 Overview

CVE-2025-14557 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the Drupal Facebook Pixel module (facebook_pixel). This vulnerability arises from improper neutralization of input during web page generation, allowing attackers with elevated privileges to inject malicious scripts that persist in the application and execute in the browsers of other users viewing the affected pages.

Critical Impact
Authenticated attackers with administrative privileges can inject persistent malicious scripts into Drupal sites using the Facebook Pixel module, potentially compromising site visitors and administrators.

Affected Products

Drupal Facebook Pixel module versions 7.X-1.0 through 7.X-1.1

Discovery Timeline

2026-01-14 - CVE CVE-2025-14557 published to NVD
2026-01-16 - Last updated in NVD database

Technical Details for CVE-2025-14557

Vulnerability Analysis

This Stored XSS vulnerability (CWE-79) exists within the Drupal Facebook Pixel module, which is commonly used to integrate Facebook's tracking pixel functionality into Drupal websites. The vulnerability allows an attacker with high-level privileges to inject malicious JavaScript code that becomes permanently stored within the application. When other users—including administrators—access pages containing the injected content, the malicious script executes within their browser context.

The stored nature of this XSS vulnerability makes it particularly dangerous compared to reflected XSS attacks, as the malicious payload persists across sessions and can affect multiple victims without requiring the attacker to craft individualized attack URLs.

Root Cause

The root cause of this vulnerability is insufficient input sanitization and output encoding within the Facebook Pixel module's configuration or content handling mechanisms. The module fails to properly neutralize user-supplied input before incorporating it into dynamically generated web pages, allowing script tags and other executable content to be stored and rendered without proper encoding.

Attack Vector

The attack vector is network-based and requires the attacker to have high-level privileges (typically administrative access) on the target Drupal installation. While this privilege requirement limits the attack surface, it remains significant in scenarios involving:

Compromised administrator accounts
Insider threats from malicious administrators
Multi-tenant environments with varying trust levels

Once the malicious script is injected, it executes in the context of any user who views the affected page. This can lead to session hijacking, credential theft, defacement, or further propagation of attacks against site visitors. The attack requires some user interaction (victim must view the affected page), which aligns with the UI:P component in the CVSS vector.

The vulnerability mechanism involves the improper handling of configuration inputs or content fields within the Facebook Pixel module. For detailed technical information, refer to the Tag1 Security Advisory.

Detection Methods for CVE-2025-14557

Indicators of Compromise

Unexpected <script> tags or JavaScript event handlers in Facebook Pixel module configuration fields
Unusual HTTP requests to external domains originating from pages utilizing the Facebook Pixel module
Browser console errors or unexpected JavaScript execution on pages with Facebook tracking integration

Detection Strategies

Implement Content Security Policy (CSP) headers with strict directives to detect and block unauthorized inline script execution
Monitor web server logs for suspicious administrative access patterns to the Facebook Pixel module configuration pages
Deploy web application firewalls (WAF) with XSS detection rules to identify and alert on potential injection attempts

Monitoring Recommendations

Enable Drupal's watchdog logging for configuration changes to the Facebook Pixel module
Implement real-time alerting for modifications to tracking pixel configurations
Regularly audit user accounts with administrative privileges for signs of compromise

How to Mitigate CVE-2025-14557

Immediate Actions Required

Review and audit all current Facebook Pixel module configurations for suspicious or unexpected content
Restrict administrative access to the Facebook Pixel module to only essential personnel
Implement strong authentication mechanisms including multi-factor authentication for all administrative accounts
Consider temporarily disabling the Facebook Pixel module until a patch is applied

Patch Information

Organizations using affected versions (7.X-1.0 through 7.X-1.1) of the Drupal Facebook Pixel module should consult the Tag1 Security Advisory and HeroDevs Vulnerability Directory for the latest patch information and remediation guidance.

Workarounds

Implement strict Content Security Policy (CSP) headers that disallow inline scripts and restrict script sources to trusted domains
Apply additional server-side input validation and output encoding for all data processed by the Facebook Pixel module
Limit administrative access to trusted IP addresses using network-level access controls

bash

# Example CSP header configuration for Apache
# Add to .htaccess or virtual host configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self' https://connect.facebook.net; object-src 'none';"