CVE-2025-31682 is a Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Drupal Google Tag module. This vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be injected and executed in the context of a user's browser. Specifically, affected versions include Google Tag from 0.0.0 before 1.8.0 and from 2.0.0 before 2.0.8. The vulnerability enables an attacker with high privileges (PR:H) and requiring user interaction (UI:R) to inject crafted input that is not properly sanitized, resulting in the execution of arbitrary scripts. The CVSS 3.1 base score is 4.8 (medium severity), with an attack vector of network (AV:N), low attack complexity (AC:L), and a scope change (S:C), indicating that exploitation can affect components beyond the vulnerable module. The impact affects confidentiality and integrity to a limited extent (C:L/I:L), but does not impact availability (A:N). No known exploits are currently observed in the wild. The vulnerability is significant because Drupal is a widely used content management system (CMS) in Europe, and the Google Tag module is commonly used for integrating Google Analytics and marketing tags, which are critical for web tracking and business intelligence. Successful exploitation could lead to session hijacking, defacement, or redirection to malicious sites, potentially compromising user data and trust. The vulnerability requires authenticated access with high privileges and user interaction, which somewhat limits the attack surface but still poses a risk especially in environments with multiple users or where privilege escalation is possible.

For European organizations, this vulnerability could lead to unauthorized disclosure of sensitive information and integrity breaches on websites running Drupal with the affected Google Tag versions. Given the widespread use of Drupal in government, education, and private sectors across Europe, exploitation could undermine user trust, lead to data leakage, and facilitate further attacks such as phishing or malware distribution. The scope change in the vulnerability suggests that exploitation could impact other components or modules, increasing the risk of broader compromise. Organizations relying on Google Tag for analytics and marketing may face disruptions in data accuracy and potential reputational damage. Although the vulnerability requires authenticated high-privilege access and user interaction, insider threats or compromised administrator accounts could be leveraged to exploit this flaw. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits over time. The impact is particularly relevant for sectors with strict data protection regulations such as GDPR, where any data leakage or unauthorized access could result in regulatory penalties.

1. Immediate upgrade of the Drupal Google Tag module to version 1.8.0 or later, or 2.0.8 or later, as these versions contain fixes for the vulnerability. 2. Implement strict input validation and output encoding on all user-supplied data, especially in custom modules or themes that interact with Google Tag or similar components. 3. Restrict administrative access to trusted personnel only and enforce multi-factor authentication (MFA) to reduce the risk of credential compromise. 4. Monitor logs for unusual administrative activities or attempts to inject scripts, focusing on user interactions that could trigger XSS. 5. Conduct regular security audits and penetration testing targeting web application input handling and privilege escalation paths. 6. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers, mitigating the impact of potential XSS attacks. 7. Educate administrators and users about the risks of phishing and social engineering that could lead to the required user interaction for exploitation. 8. Isolate critical Drupal instances and limit network exposure to reduce the attack surface.