CVE-2025-13985 is a security vulnerability classified under CWE-863 (Incorrect Authorization) affecting the Drupal Entity Share module versions prior to 3.13.0. The flaw allows an attacker to bypass authorization controls and perform forceful browsing, meaning they can access entities or resources that should be restricted. This vulnerability arises due to improper enforcement of access control checks within the module, enabling unauthorized users to enumerate or view shared entities without authentication or privileges. The CVSS 3.1 base score of 5.3 reflects a medium severity level, with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U), and limited confidentiality impact (C:L), with no impact on integrity (I:N) or availability (A:N). The vulnerability does not require authentication or user interaction, making it easier to exploit remotely. Although no known exploits are currently reported in the wild, the potential for unauthorized data disclosure exists, especially in environments where sensitive or confidential information is shared via the Entity Share module. The module is commonly used in Drupal-based content management systems to facilitate entity sharing between sites or users, so improper authorization can lead to unintended data exposure. The vulnerability was reserved in December 2025 and published in January 2026, with no official patch links provided yet, indicating that organizations should monitor for updates and apply patches promptly once available.

For European organizations, this vulnerability poses a risk of unauthorized data exposure through forceful browsing of shared entities in Drupal sites using the vulnerable Entity Share module. Confidentiality of sensitive information could be compromised, especially in sectors such as government, healthcare, finance, and education, where Drupal is widely used for content management. Although the impact on integrity and availability is negligible, unauthorized access to data can lead to privacy violations, regulatory non-compliance (e.g., GDPR), and reputational damage. Attackers can exploit this vulnerability remotely without authentication, increasing the risk of widespread scanning and data leakage. Organizations with public-facing Drupal sites or interlinked Drupal instances sharing sensitive entities are particularly at risk. The lack of known exploits in the wild currently reduces immediate threat but does not eliminate the risk of future exploitation once exploit code becomes available.

1. Upgrade the Drupal Entity Share module to version 3.13.0 or later as soon as the patch is released to address the authorization flaw. 2. Until a patch is available, implement strict access control policies at the web server or application firewall level to restrict access to sensitive entity sharing endpoints. 3. Review and tighten Drupal user permissions related to entity sharing to minimize exposure. 4. Monitor web server and Drupal logs for unusual or unauthorized access attempts indicative of forceful browsing. 5. Employ network segmentation and limit public exposure of Drupal instances that handle sensitive data. 6. Conduct regular security audits and penetration testing focusing on authorization controls within Drupal modules. 7. Educate administrators and developers about the risks of incorrect authorization and best practices for secure module configuration. 8. Subscribe to Drupal security advisories and CVE databases to stay informed about patch releases and emerging threats related to this vulnerability.