CVE-2025-66134 is a missing authorization vulnerability identified in NinjaTeam's FileBird Pro plugin for WordPress, affecting versions up to and including 6.4.9. The vulnerability arises from incorrectly configured access control mechanisms, allowing users with low privileges (PR:L) to perform unauthorized actions or access restricted resources without proper authorization checks. The CVSS v3.1 base score is 5.4, indicating a medium severity level. The attack vector is network-based (AV:N), requiring no user interaction (UI:N), and the scope remains unchanged (S:U). The impact affects confidentiality and integrity to a limited extent (C:L/I:L), with no impact on availability (A:N). This means an attacker who can authenticate with low privileges can exploit the vulnerability remotely to access or modify data they should not have access to, potentially leading to information leakage or unauthorized modifications within the file management system. No known exploits are currently active in the wild, and no official patches have been published at the time of disclosure. The vulnerability was reserved on 2025-11-21 and published on 2025-12-16. Given FileBird Pro's role in managing file structures within WordPress sites, exploitation could compromise sensitive file organization and metadata, affecting website integrity and confidentiality.

For European organizations, especially those relying on WordPress with the FileBird Pro plugin, this vulnerability could lead to unauthorized access to file management functions, resulting in potential exposure of sensitive data or unauthorized modifications. This can impact confidentiality and integrity of organizational data, particularly for companies managing regulated or sensitive information such as financial, healthcare, or personal data under GDPR. While availability is not impacted, the breach of access controls could facilitate further attacks or data leakage. Organizations with multi-user WordPress environments or those allowing low-privilege users to interact with file management features are at higher risk. The lack of known exploits reduces immediate risk, but the medium severity score warrants proactive mitigation to prevent exploitation. The impact is more pronounced in sectors with strict compliance requirements and where data integrity is critical.

1. Immediately review and restrict user roles and permissions within WordPress to ensure that only trusted users have access to FileBird Pro functionalities. 2. Implement strict access control policies and audit logs to monitor file management activities for suspicious behavior. 3. Temporarily disable or limit the use of FileBird Pro plugin if feasible until a security patch is released by NinjaTeam. 4. Follow NinjaTeam’s official channels for updates and apply patches promptly once available. 5. Employ Web Application Firewalls (WAF) with custom rules to detect and block unauthorized access attempts targeting FileBird Pro endpoints. 6. Conduct regular security assessments and penetration tests focusing on WordPress plugins and access control mechanisms. 7. Educate administrators and users about the risks of privilege escalation and the importance of maintaining least privilege principles. 8. Consider isolating critical WordPress instances or using containerization to limit the blast radius in case of exploitation.