CVE-2025-11016 is a path traversal vulnerability identified in the kalcaddle kodbox software, specifically affecting versions up to and including 1.61.09. The vulnerability resides in the fileOut function within the app/controller/explorer/index.class.php file. Path traversal vulnerabilities occur when an attacker can manipulate input parameters to access files and directories outside the intended scope, potentially exposing sensitive data or system files. In this case, the argument 'path' is susceptible to manipulation, allowing an attacker to traverse directories on the server remotely without authentication or user interaction. The vulnerability has been publicly disclosed, and although the vendor was notified early, no response or patch has been provided to date. The CVSS v4.0 base score is 5.3, indicating a medium severity level. The vector details indicate that the attack can be performed remotely (AV:N), requires low attack complexity (AC:L), no privileges (PR:L) or user interaction (UI:N), and impacts confidentiality to a limited extent (VC:L), with no impact on integrity or availability. No known exploits are currently observed in the wild, but public disclosure increases the risk of exploitation attempts. Kodbox is a web-based file management system, often deployed in enterprise environments for file sharing and collaboration, making this vulnerability a concern for organizations relying on it for internal or external file access.

For European organizations using kodbox, this vulnerability could lead to unauthorized disclosure of sensitive files stored on the server, including configuration files, user data, or other critical documents. Although the impact on integrity and availability is not indicated, the confidentiality breach could result in data leaks, compliance violations (e.g., GDPR), and reputational damage. Attackers exploiting this flaw remotely without authentication increase the risk profile, especially for publicly accessible kodbox instances. Organizations in sectors such as finance, healthcare, and government, where data sensitivity is paramount, may face heightened risks. Additionally, the lack of vendor response and patch availability prolongs exposure, necessitating immediate mitigation. The medium severity rating suggests the threat is significant but not critical; however, the ease of exploitation and potential data exposure warrant prompt attention.

Given the absence of an official patch, European organizations should implement compensating controls immediately. These include restricting access to kodbox instances via network segmentation and firewall rules to trusted IP addresses only, thereby reducing exposure to the internet. Employ web application firewalls (WAFs) with custom rules to detect and block path traversal patterns in HTTP requests targeting the vulnerable fileOut function. Conduct thorough audits of server file permissions to ensure kodbox processes have minimal privileges, limiting the scope of accessible files. Monitor logs for suspicious path traversal attempts and anomalous file access patterns. If feasible, temporarily disable or restrict the vulnerable functionality until a vendor patch is released. Organizations should also consider alternative secure file management solutions if kodbox is critical and no timely fix is forthcoming. Finally, maintain up-to-date backups of all critical data to mitigate potential data loss from exploitation.