CVE-2025-10931 is a security vulnerability classified under CWE-79, indicating improper neutralization of input during web page generation, commonly known as Cross-Site Scripting (XSS). This vulnerability specifically affects the Umami Analytics module of Drupal, a popular content management system widely used for website and analytics management. The affected versions include all releases before 1.0.1, with the initial vulnerable version being 0.0.0. The vulnerability allows an attacker to inject malicious scripts into web pages generated by the Umami Analytics module. When a victim loads the compromised page, the malicious script executes in their browser context, potentially leading to session hijacking, credential theft, unauthorized actions on behalf of the user, or defacement of the analytics dashboard. The vulnerability stems from insufficient sanitization or encoding of user-supplied input before rendering it in the web interface. No authentication is required to exploit this vulnerability, increasing its risk profile. Although no known exploits have been reported in the wild as of the publication date, the public disclosure and availability of technical details raise the likelihood of future exploitation attempts. The absence of a CVSS score necessitates an independent severity assessment. The vulnerability impacts confidentiality and integrity primarily, with potential secondary effects on availability if exploited to deface or disrupt analytics services. The scope includes all installations of Drupal Umami Analytics prior to version 1.0.1, which may be integrated into various organizational websites and analytics platforms. The vulnerability was officially published on October 29, 2025, with the reservation date on September 24, 2025, indicating a recent discovery and disclosure timeline. No official patches or mitigation links were provided at the time of disclosure, emphasizing the need for immediate attention from users of the affected module.

For European organizations, the impact of CVE-2025-10931 can be significant, especially for those relying on Drupal Umami Analytics for web traffic analysis and reporting. Successful exploitation could lead to unauthorized access to user sessions, theft of sensitive analytics data, and manipulation or defacement of analytics dashboards. This can undermine trust in the organization's web presence and analytics integrity, potentially affecting decision-making processes based on compromised data. Public-facing analytics portals are particularly vulnerable, as attackers can leverage XSS to target a broad user base, including administrators and analysts. Additionally, exploitation could serve as a foothold for further attacks within the organization's network, such as phishing or lateral movement. The lack of authentication requirement lowers the barrier for attackers, increasing the risk of widespread exploitation. Given the GDPR and other data protection regulations in Europe, data breaches resulting from this vulnerability could also lead to regulatory penalties and reputational damage. Organizations in sectors with high reliance on web analytics, such as e-commerce, media, and government services, may face heightened risks.

To mitigate CVE-2025-10931, European organizations should immediately upgrade Drupal Umami Analytics to version 1.0.1 or later once available, as this version addresses the vulnerability. In the absence of an official patch, organizations should implement strict input validation and output encoding on all user-supplied data rendered by the analytics module. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Conduct thorough code reviews and penetration testing focused on XSS vectors within the analytics module. Disable or restrict access to the Umami Analytics interface to trusted users and networks where feasible. Monitor web server and application logs for suspicious activity indicative of XSS exploitation attempts. Educate administrators and users about the risks of XSS and encourage vigilance when interacting with analytics dashboards. Consider deploying web application firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting Drupal modules. Maintain an inventory of all Drupal modules in use to ensure timely updates and vulnerability management.