CVE-2025-10926 is a Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Drupal JSON Field module versions prior to 1.5. The vulnerability stems from improper neutralization of input during web page generation, which allows malicious actors to inject and execute arbitrary JavaScript code in the context of a victim's browser. This occurs because the JSON Field module fails to adequately sanitize or encode user-supplied input before rendering it on web pages. The vulnerability is remotely exploitable over the network without requiring authentication (AV:N/PR:N), but it does require user interaction (UI:R), such as clicking a crafted link or visiting a malicious page. The scope is changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component, potentially impacting the confidentiality and integrity of user data. The CVSS v3.1 base score is 6.1, reflecting medium severity, with partial impact on confidentiality and integrity but no impact on availability. No public exploits have been reported yet, but the vulnerability is publicly disclosed and should be considered a credible risk. The affected versions include all releases before 1.5 of the JSON Field module, which is commonly used in Drupal-based content management systems to handle JSON data fields. Given Drupal's widespread use in Europe for government, education, and enterprise websites, this vulnerability poses a tangible risk to organizations relying on affected versions. Attackers could leverage this XSS flaw to steal session cookies, perform actions on behalf of users, or conduct phishing attacks by injecting malicious scripts. The vulnerability was reserved on 2025-09-24 and published on 2025-10-29, indicating a recent disclosure. No patches are linked in the provided data, but upgrading to version 1.5 or later is implied as the remediation path. Organizations should also review their input validation and output encoding practices to mitigate similar risks.

For European organizations, this vulnerability can lead to unauthorized disclosure of sensitive information such as session tokens or personal data, undermining user trust and potentially violating GDPR requirements. The integrity of user interactions can be compromised, enabling attackers to perform unauthorized actions or deliver malicious payloads to users. Although availability is not impacted, the reputational damage and potential regulatory penalties can be significant. Public-facing Drupal sites in sectors like government, finance, healthcare, and education are particularly at risk due to their reliance on Drupal and the sensitivity of their data. The need for user interaction to exploit the vulnerability means that phishing or social engineering campaigns could be used to trigger attacks. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits after public disclosure. Failure to address this vulnerability promptly could lead to targeted attacks against European organizations, especially those with high-profile web assets.

1. Immediately upgrade the Drupal JSON Field module to version 1.5 or later, where the vulnerability is fixed. 2. Implement strict input validation on all JSON data fields to ensure only expected data types and formats are accepted. 3. Apply proper output encoding/escaping techniques when rendering user-supplied data in web pages to prevent script execution. 4. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 5. Conduct security audits and code reviews focusing on input handling and output generation in custom Drupal modules or themes. 6. Educate users and administrators about phishing risks and encourage cautious behavior regarding unsolicited links or content. 7. Monitor web application logs for unusual activity that could indicate exploitation attempts. 8. Utilize web application firewalls (WAFs) with rules targeting XSS attack patterns to provide an additional layer of defense. 9. Regularly update Drupal core and contributed modules to incorporate security patches promptly. 10. Consider deploying security scanners that can detect XSS vulnerabilities in web applications.