CVE-2025-8362 is a Cross-Site Scripting (XSS) vulnerability identified in the Drupal GoogleTag Manager module, specifically affecting versions prior to 1.10.0 (noted as from 0.0.0 before 1.10.0). The vulnerability is classified under CWE-79, which involves improper neutralization of input during web page generation. This means that the module fails to adequately sanitize or encode user-supplied input before rendering it on web pages, allowing attackers to inject malicious scripts. When exploited, an attacker can execute arbitrary JavaScript in the context of the victim's browser session. The CVSS v3.1 base score is 4.3 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), no impact on confidentiality (C:N), low impact on integrity (I:L), and no impact on availability (A:N). This suggests that the attack can be launched remotely without authentication but requires the victim to interact with a crafted link or input. The impact is primarily limited to integrity, such as defacement or script injection, but does not directly compromise confidentiality or availability. No known exploits are currently reported in the wild, and no patches or mitigation links are provided yet. The vulnerability affects the GoogleTag Manager integration within Drupal, a widely used content management system, which is often deployed by organizations to manage website analytics and marketing tags. Improper input handling in this module could allow attackers to manipulate website content or steal session tokens if combined with other vulnerabilities or social engineering techniques.

For European organizations using Drupal with the GoogleTag Manager module, this vulnerability poses a moderate risk. Successful exploitation could lead to the injection of malicious scripts into web pages, potentially enabling attackers to perform actions such as session hijacking, phishing, or delivering malware to site visitors. While the vulnerability does not directly expose sensitive data or cause service disruption, it undermines the integrity of web content and can damage organizational reputation. Organizations in sectors with high web presence, such as e-commerce, media, government, and education, may face increased risks from attackers exploiting this vulnerability to target end users or employees. Additionally, regulatory frameworks like GDPR emphasize protecting user data and privacy, and XSS attacks that lead to data theft or unauthorized access could result in compliance violations and fines. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially if attackers craft convincing social engineering campaigns. The absence of known exploits in the wild suggests limited active targeting so far, but the public disclosure increases the likelihood of future exploitation attempts.

European organizations should take proactive steps to mitigate this vulnerability beyond generic advice: 1) Immediately audit Drupal installations to identify the presence and version of the GoogleTag Manager module. 2) Upgrade the module to version 1.10.0 or later as soon as it becomes available to ensure the vulnerability is patched. 3) In the interim, implement strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. 4) Employ web application firewalls (WAFs) with rules specifically targeting common XSS attack patterns to detect and block malicious requests. 5) Conduct thorough input validation and output encoding on all user-supplied data within custom Drupal modules or themes to prevent injection vectors. 6) Educate web administrators and content editors about the risks of XSS and the importance of cautious handling of user input and third-party scripts. 7) Monitor web logs and security alerts for suspicious activity indicative of attempted XSS exploitation. 8) Consider isolating or sandboxing third-party scripts like GoogleTag Manager to limit their ability to affect the main site context. These steps combined will reduce the attack surface and help maintain website integrity until a patch is applied.