CVE-2025-10927 identifies a Cross-Site Scripting (XSS) vulnerability classified under CWE-79 in the Drupal Plausible tracking module, affecting versions prior to 1.0.2. The vulnerability stems from improper neutralization of user-supplied input during web page generation, which allows attackers to inject malicious JavaScript code into web pages served by the affected Drupal module. When a victim user interacts with the crafted content, the malicious script executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability is remotely exploitable over the network without requiring authentication, but user interaction is necessary to trigger the payload. The CVSS v3.1 score of 6.1 reflects a medium severity, with attack vector being network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), but requiring user interaction (UI:R). The scope is changed (S:C), indicating that the vulnerability can affect resources beyond the vulnerable component. Confidentiality and integrity impacts are low, while availability is not affected. No patches are currently linked, and no exploits have been reported in the wild as of the publication date. The vulnerability was reserved on 2025-09-24 and published on 2025-10-29. The Drupal Plausible tracking module is used to integrate privacy-focused web analytics, and its compromise could undermine user trust and data privacy.

For European organizations, this vulnerability poses a risk primarily to the confidentiality and integrity of user data and session information. Exploitation could allow attackers to steal session cookies, enabling account takeover or impersonation within Drupal-based websites. This could lead to unauthorized access to sensitive information or manipulation of website content, damaging organizational reputation and user trust. Although availability is not impacted, the breach of confidentiality and integrity can have regulatory implications under GDPR, especially if personal data is exposed or manipulated. Organizations relying on Drupal with the Plausible tracking module for web analytics or user tracking are at risk of targeted attacks, particularly those with high web traffic or handling sensitive user data. The need for user interaction to trigger the exploit means phishing or social engineering campaigns could be used to facilitate attacks. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as public disclosure may prompt attackers to develop exploits.

European organizations should immediately inventory their Drupal installations to identify use of the Plausible tracking module and its version. Until an official patch is released, organizations should implement strict input validation and output encoding on all user-supplied data within the module's context to prevent script injection. Deploying Content Security Policy (CSP) headers can help restrict execution of unauthorized scripts. Web Application Firewalls (WAFs) should be configured to detect and block common XSS payload patterns targeting Drupal modules. User awareness training should emphasize caution with unsolicited links or content that could trigger XSS attacks. Monitoring web logs for unusual requests or script injection attempts can provide early detection. Once Drupal releases an update beyond version 1.0.2, organizations must prioritize applying the patch promptly. Additionally, reviewing and limiting the permissions of Drupal modules and restricting administrative access can reduce potential attack surface.