CVE-2025-40656 is a critical SQL injection vulnerability identified in the DM Corporative CMS developed by Dmacroweb. The vulnerability exists in the /administer/node-selection/data.asp endpoint, specifically through the 'cod' parameter. Due to improper neutralization of special elements in SQL commands (CWE-89), an attacker can inject malicious SQL code. This allows unauthorized manipulation of the backend database, including the ability to retrieve, create, update, and delete data without authentication or user interaction. The vulnerability has a CVSS 4.0 base score of 9.3, indicating a critical severity with network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. The vulnerability affects version 0 of the product, which likely refers to initial or early releases of DM Corporative CMS. No patches or known exploits in the wild have been reported yet. Given the nature of the vulnerability, exploitation could lead to full compromise of the CMS data, potentially exposing sensitive organizational information, enabling data tampering, or causing service disruption.

For European organizations using DM Corporative CMS, this vulnerability poses a significant risk. Exploitation could lead to unauthorized data disclosure, modification, or deletion, impacting business operations, customer data privacy, and regulatory compliance such as GDPR. The ability to manipulate database contents without authentication means attackers could deface websites, inject malicious content, or pivot to other internal systems. This could result in reputational damage, financial losses, and legal consequences. Organizations in sectors with high data sensitivity, such as finance, healthcare, and government, are particularly vulnerable. Additionally, the lack of known exploits currently means organizations have a window to proactively mitigate the risk before widespread attacks occur.

Immediate mitigation steps include: 1) Conducting a thorough inventory to identify any deployments of DM Corporative CMS, especially version 0. 2) Applying any available patches or updates from Dmacroweb as soon as they are released. 3) Implementing web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the 'cod' parameter in /administer/node-selection/data.asp. 4) Employing input validation and parameterized queries if organizations maintain or customize the CMS codebase. 5) Restricting access to the administration interface by IP whitelisting or VPN to limit exposure. 6) Monitoring logs for suspicious activity related to SQL injection patterns. 7) Planning for incident response in case of exploitation. Since no patch is currently available, layered defenses and network segmentation are critical to reduce attack surface.