CVE-2025-15393 is a code injection vulnerability identified in Kohana KodiCMS up to version 13.82.135, specifically within the Save function of the Layout API Endpoint component located in cms/modules/kodicms/classes/kodicms/model/file.php. The vulnerability stems from insufficient sanitization or validation of the 'content' parameter, which an attacker can manipulate remotely to inject malicious code. This code injection can lead to arbitrary code execution on the server hosting the CMS, potentially allowing attackers to compromise the confidentiality, integrity, and availability of the system. The attack vector is network-based (AV:N), requires low attack complexity (AC:L), no authentication (AT:N), and no user interaction (UI:N), but requires low privileges (PR:L), indicating that an attacker with limited access could exploit it. The vulnerability impacts the confidentiality, integrity, and availability of the system to a limited extent (VC:L, VI:L, VA:L). The vendor was notified early but has not responded or provided a patch, increasing the risk for users. Although no exploits have been observed in the wild, the public disclosure of the vulnerability increases the likelihood of exploitation attempts. The CVSS 4.0 score of 5.3 classifies this as a medium severity issue. The lack of vendor response and patch availability necessitates immediate attention from users of this CMS to implement compensating controls and monitor for exploitation attempts.

For European organizations using Kohana KodiCMS, this vulnerability poses a moderate risk of remote code execution, which could lead to unauthorized access, data leakage, defacement, or service disruption. Public-facing websites or intranet portals running vulnerable versions are particularly at risk. Exploitation could result in compromise of sensitive customer or business data, damage to organizational reputation, and potential regulatory non-compliance under GDPR if personal data is affected. The medium severity score reflects that while the vulnerability is exploitable remotely without user interaction, it requires low privileges, which may limit exposure to some extent. However, given the lack of vendor patching and public exploit disclosure, attackers may develop weaponized exploits, increasing the threat level. Organizations relying on this CMS for critical business functions or hosting sensitive information should consider the impact significant enough to warrant immediate mitigation.

Since no official patch is available due to vendor non-response, organizations should implement the following specific mitigations: 1) Apply strict input validation and sanitization on all parameters, especially the 'content' argument in the Layout API Endpoint, to prevent injection of malicious code. 2) Restrict access to the vulnerable Save function by implementing network-level controls such as IP whitelisting or VPN access to limit exposure. 3) Employ web application firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting the vulnerable endpoint. 4) Isolate the CMS environment using containerization or segmentation to limit potential lateral movement if exploited. 5) Monitor logs and network traffic for anomalous activity indicative of exploitation attempts, including unexpected code execution or file modifications. 6) Consider migrating to alternative CMS platforms or upgrading to a version without this vulnerability once available. 7) Conduct regular security assessments and penetration testing focused on this vulnerability vector. These measures go beyond generic advice by focusing on compensating controls and proactive detection in the absence of a vendor patch.