CVE-2025-12083 is a Cross-Site Scripting (XSS) vulnerability classified under CWE-79, found in the Drupal CivicTheme Design System prior to version 1.12.0. This vulnerability arises from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts into web pages rendered by the affected system. The flaw is exploitable remotely over the network without requiring authentication, but it does require user interaction, such as clicking a crafted link or visiting a malicious page. The vulnerability impacts the confidentiality and integrity of affected systems by enabling attackers to execute arbitrary scripts in the context of the victim’s browser, potentially leading to session hijacking, credential theft, or content manipulation. Availability is not impacted. The CVSS v3.1 base score is 6.1, indicating medium severity, with the vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, meaning it is remotely exploitable with low attack complexity, no privileges required, but user interaction is necessary, and the scope is changed due to potential cross-origin impacts. No public exploits have been reported yet, but the vulnerability is publicly disclosed and should be addressed promptly. The affected product, Drupal CivicTheme Design System, is a theming framework used in Drupal-based websites, which are widely deployed across various sectors including government, education, and enterprise in Europe. The vulnerability affects all versions before 1.12.0, with no patch links currently available, indicating that a fix may be forthcoming or in development.

For European organizations, this XSS vulnerability poses a risk primarily to confidentiality and integrity of web applications using the Drupal CivicTheme Design System. Attackers could exploit this flaw to steal user session cookies, perform actions on behalf of users, or deface websites, undermining trust and potentially leading to data breaches or reputational damage. Public sector websites, e-commerce platforms, and any service relying on Drupal CivicTheme are at risk of targeted attacks, especially those handling sensitive user data or critical services. The requirement for user interaction limits automated exploitation but does not eliminate risk, as phishing or social engineering can facilitate attacks. The vulnerability does not affect availability directly but could lead to indirect service disruptions if exploited at scale or combined with other attacks. Given Drupal’s significant market share in Europe, especially in countries with strong digital government initiatives, the impact could be widespread if not mitigated promptly.

Organizations should monitor Drupal’s official channels for the release of version 1.12.0 or later that addresses this vulnerability and apply updates immediately upon availability. In the interim, implement strict input validation and output encoding on all user-supplied data within the CivicTheme Design System 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. Educate users about the risks of clicking untrusted links and implement web application firewalls (WAFs) with rules targeting XSS patterns specific to Drupal CivicTheme. Conduct thorough security testing and code reviews focusing on input handling in custom themes or modules that extend CivicTheme. Additionally, restrict user privileges and session lifetimes to minimize the window of opportunity for attackers. Logging and monitoring for unusual web requests or script injection attempts can help detect exploitation attempts early.