CVE-2025-13083 is a vulnerability classified under CWE-525, concerning the use of web browser cache containing sensitive information in Drupal core. This issue arises from incorrectly configured access control security levels that allow sensitive data to be cached by the user's web browser. Affected versions include Drupal core from 7.0 before 7.103, 8.0.0 before 10.4.9, 10.5.0 before 10.5.6, 11.0.0 before 11.1.9, and 11.2.0 before 11.2.8. The vulnerability does not require user interaction or privileges but has a high attack complexity, meaning exploitation is not straightforward. The impact is limited to confidentiality, as attackers could potentially retrieve sensitive information from the browser cache if they gain access to the victim's device or browser data. There are no known exploits in the wild at the time of publication. The vulnerability is mitigated by proper configuration of cache-control headers and access control settings within Drupal to prevent sensitive content from being cached by browsers. Since Drupal is widely used for content management across many sectors, improper caching could expose sensitive user or organizational data if left unpatched.

For European organizations, the primary impact of CVE-2025-13083 is the potential unauthorized disclosure of sensitive information through browser cache leakage. This could include session tokens, personal data, or confidential content accessible via cached pages. While the vulnerability does not allow direct system compromise or data manipulation, the confidentiality breach could facilitate further attacks such as session hijacking or identity theft. Organizations in sectors handling sensitive personal data (e.g., government, healthcare, finance) are particularly at risk. The impact is mitigated by the high attack complexity and the requirement for physical or remote access to the victim's browser cache, limiting large-scale exploitation. However, organizations with remote or shared work environments should be cautious, as cached data on shared devices could be accessed by unauthorized users. Failure to address this vulnerability could lead to reputational damage and non-compliance with data protection regulations like GDPR if personal data is exposed.

1. Immediately update Drupal core to the latest patched versions: 7.103, 10.4.9 or later, 10.5.6 or later, 11.1.9 or later, and 11.2.8 or later. 2. Review and enforce strict cache-control headers (e.g., 'Cache-Control: no-store, no-cache, must-revalidate') on pages serving sensitive information to prevent browser caching. 3. Audit and correct access control configurations within Drupal to ensure sensitive content is not accessible without proper authorization. 4. Educate users and administrators about the risks of browser caching sensitive data, especially on shared or public devices. 5. Implement browser security policies such as Content Security Policy (CSP) and HTTP Strict Transport Security (HSTS) to reduce attack surface. 6. Regularly monitor and audit web server and application logs for unusual access patterns that might indicate attempts to exploit cached data. 7. Consider deploying endpoint security solutions that protect browser cache data on user devices, especially in high-risk environments. 8. Conduct periodic security assessments and penetration testing focusing on cache-related vulnerabilities.