CVE-2025-14556 identifies a Cross-Site Scripting (XSS) vulnerability in the Drupal Flag module versions 7.x-3.0 through 7.x-3.9. This vulnerability stems from improper neutralization of user-supplied input during web page generation, classified under CWE-79. The flaw allows attackers to inject malicious JavaScript code into web pages viewed by other users, potentially leading to session hijacking, credential theft, or unauthorized actions performed in the context of the victim's browser session. The vulnerability is remotely exploitable without requiring authentication, but it does require user interaction, such as clicking a crafted link or visiting a malicious page. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), user interaction required (UI:A), and low scope impact (S:I), with no impact on confidentiality, integrity, or availability directly. No known exploits have been reported in the wild, and no official patches were linked at the time of publication, suggesting that remediation may require monitoring for updates or applying custom mitigations. The vulnerability affects Drupal 7.x Flag module, which is widely used for content flagging and voting functionalities in Drupal-based websites, making it relevant for many organizations relying on Drupal 7.x for content management.

For European organizations, this vulnerability poses a moderate risk primarily to public-facing Drupal websites using the Flag module. Successful exploitation could allow attackers to execute arbitrary scripts in the context of users’ browsers, leading to session hijacking, phishing, or defacement. This can damage organizational reputation, lead to data leakage, and undermine user trust. Sectors such as government, education, e-commerce, and media, which frequently use Drupal, are particularly vulnerable. The impact is heightened in environments where users have elevated privileges or where sensitive transactions occur via the affected web applications. Although the vulnerability does not directly compromise system integrity or availability, the indirect consequences of XSS attacks can be severe, including unauthorized access and data exposure. The lack of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers often weaponize such vulnerabilities once disclosed.

Organizations should prioritize upgrading the Drupal Flag module to a patched version once it becomes available. In the interim, implement strict input validation and sanitization on all user-supplied data related to the Flag module to prevent script injection. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. Regularly audit and monitor web application logs for suspicious activities indicative of attempted exploitation. Educate users about the risks of clicking unknown links and encourage the use of security-aware browsing practices. Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting Drupal modules. Finally, maintain an up-to-date inventory of Drupal modules and versions to ensure timely patch management.