CVE-2025-12761 is a vulnerability classified under CWE-79, indicating improper neutralization of input during web page generation, commonly known as Cross-Site Scripting (XSS). This vulnerability exists in the Drupal Simple multi step form module versions prior to 2.0.0, specifically affecting versions from 0.0.0 up to but not including 2.0.0. The flaw allows attackers to inject malicious scripts into web pages generated by the module, which are then executed in the context of users' browsers visiting the affected Drupal site. Such XSS attacks can lead to a range of malicious outcomes including theft of session cookies, redirection to malicious sites, or unauthorized actions performed on behalf of the user. The vulnerability stems from insufficient sanitization or encoding of user-supplied input before it is embedded in the HTML output. Although no known exploits have been reported in the wild as of the publication date, the vulnerability is publicly disclosed and thus poses a risk of exploitation. The affected module is used to create multi-step forms within Drupal, a widely used content management system, making the attack surface significant for websites relying on this functionality. The absence of a CVSS score requires an assessment based on the nature of the vulnerability, which is relatively easy to exploit without authentication or user interaction beyond visiting a crafted page. This vulnerability primarily impacts the confidentiality and integrity of user data and the availability of the affected web application if exploited at scale. The module maintainers are expected to release a patch in version 2.0.0 or later, but no patch links are currently available. Organizations using this module should monitor for updates and consider interim mitigations such as input validation and output encoding.

For European organizations, the impact of CVE-2025-12761 can be significant, especially for those operating public-facing Drupal websites that utilize the Simple multi step form module. Successful exploitation can lead to session hijacking, allowing attackers to impersonate legitimate users and potentially gain unauthorized access to sensitive information or administrative functions. This can result in data breaches, loss of customer trust, and regulatory penalties under GDPR for failing to protect personal data. Additionally, attackers could deface websites or redirect users to malicious domains, damaging brand reputation and causing operational disruptions. The vulnerability's exploitation does not require authentication, increasing the risk of widespread attacks. Organizations in sectors such as government, finance, healthcare, and e-commerce, which often rely on Drupal for content management and customer interaction, are particularly vulnerable. The potential for automated exploitation tools to emerge after public disclosure further elevates the threat level. Given the interconnected nature of European digital infrastructure, a successful attack could also have cascading effects on supply chains and partner organizations.

To mitigate CVE-2025-12761, European organizations should take the following specific actions: 1) Immediately inventory all Drupal installations to identify those using the Simple multi step form module and verify the version in use. 2) Monitor Drupal security advisories and update the module to version 2.0.0 or later as soon as it becomes available to apply the official patch. 3) In the interim, implement strict input validation and output encoding on all user-supplied data processed by the module to prevent malicious script injection. 4) Employ Web Application Firewalls (WAFs) with rules designed to detect and block common XSS payloads targeting Drupal forms. 5) Conduct security awareness training for web developers and administrators to recognize and remediate XSS vulnerabilities in custom code or third-party modules. 6) Regularly scan web applications with automated tools capable of detecting XSS vulnerabilities, focusing on multi-step form workflows. 7) Review and tighten Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 8) Implement robust logging and monitoring to detect suspicious activities indicative of exploitation attempts. 9) Engage in coordinated vulnerability disclosure with Drupal maintainers and security communities to stay informed of emerging threats and patches. 10) Consider isolating or temporarily disabling the vulnerable module if immediate patching is not feasible, especially on high-risk or critical systems.