CVE-2025-56316 is a critical SQL injection vulnerability identified in version 5.5.0 of the MCMS content management system. The vulnerability exists in the content_title parameter of the /cms/content/list API endpoint, where user-supplied input is improperly sanitized before being processed by the FreeMarker template engine. This improper input validation allows attackers to inject arbitrary SQL queries remotely, without requiring authentication or user interaction. Exploiting this vulnerability could lead to unauthorized data disclosure, modification, or deletion, as well as potential full system compromise depending on the database privileges. The vulnerability is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), which is a common and severe injection flaw. The CVSS v3.1 base score of 9.8 reflects the vulnerability's critical nature, with attack vector being network-based, no privileges required, no user interaction needed, and full impact on confidentiality, integrity, and availability. Although no public exploits have been reported yet, the vulnerability's characteristics make it a prime target for attackers aiming to compromise MCMS deployments. The lack of available patches at the time of publication increases the urgency for organizations to implement temporary mitigations or monitoring until a fix is released.

For European organizations, the impact of CVE-2025-56316 could be severe. MCMS is often used in government portals, public sector websites, and private enterprises for content management. Exploitation could lead to unauthorized access to sensitive data, including personal data protected under GDPR, resulting in legal and financial repercussions. Data integrity could be compromised, allowing attackers to alter or delete critical content, potentially disrupting services or spreading misinformation. Availability could also be affected if attackers execute destructive SQL commands or cause database corruption, leading to downtime and loss of trust. The critical severity and ease of exploitation mean that attackers could rapidly compromise multiple systems across organizations, especially those with internet-facing MCMS instances. This could facilitate further lateral movement or ransomware deployment. The reputational damage and regulatory penalties for data breaches in Europe could be substantial.

European organizations using MCMS 5.5.0 should immediately audit their systems for exposure of the /cms/content/list endpoint and the usage of the content_title parameter. Until an official patch is released, implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting this parameter. Employ strict input validation and sanitization at the application layer, particularly for FreeMarker template inputs. Restrict database user privileges to the minimum necessary to limit the impact of potential injection attacks. Monitor logs for unusual SQL queries or errors indicative of injection attempts. Conduct penetration testing focused on this endpoint to verify the effectiveness of mitigations. Additionally, segment and isolate critical systems to prevent lateral movement if compromise occurs. Prepare incident response plans specific to SQL injection exploitation scenarios. Once patches become available, prioritize their deployment and verify their effectiveness through testing.