CVE-2025-40655 is a critical SQL injection vulnerability identified in the DM Corporative CMS developed by Dmacroweb. The vulnerability resides in the 'name' parameter of the /antcatalogue.asp endpoint, where improper neutralization of special elements in SQL commands allows an attacker to manipulate backend database queries. This flaw corresponds to CWE-89, indicating that user-supplied input is not properly sanitized or parameterized before being incorporated into SQL statements. Exploiting this vulnerability enables an unauthenticated attacker to perform unauthorized actions on the database, including retrieving sensitive data, creating new records, updating existing entries, or deleting data. The CVSS v4.0 score of 9.3 reflects the high severity, with attack vector being network-based, no privileges or user interaction required, and a high impact on confidentiality, integrity, and availability of the affected system. Although no known exploits have been reported in the wild yet, the vulnerability’s characteristics make it highly exploitable and dangerous. The affected version is listed as '0', which likely indicates an initial or early release version of the CMS. The lack of available patches at the time of publication increases the urgency for mitigation. This vulnerability can lead to full compromise of the CMS database, potentially exposing sensitive organizational data, enabling data tampering, or causing denial of service through data deletion or corruption.

For European organizations using DM Corporative CMS, this vulnerability poses a significant risk. Successful exploitation could lead to exposure of confidential business information, customer data, or intellectual property, violating GDPR and other data protection regulations. The ability to modify or delete database contents threatens operational continuity and data integrity, potentially disrupting business processes and damaging reputation. Given the CMS nature, websites or intranet portals relying on this platform could be defaced or rendered inoperable, impacting customer trust and service availability. Additionally, attackers could leverage the compromised CMS as a foothold for further network intrusion or lateral movement within the organization’s infrastructure. The critical severity and ease of exploitation without authentication make this a high-priority threat for European entities, especially those in sectors with stringent compliance requirements such as finance, healthcare, and government.

Immediate mitigation steps include: 1) Conducting an inventory to identify all instances of DM Corporative CMS in use within the organization. 2) Applying any available vendor patches or updates as soon as they are released. Since no patches are currently available, organizations should implement compensating controls such as: 3) Employing Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the /antcatalogue.asp endpoint and the 'name' parameter. 4) Restricting database user permissions to the minimum necessary, preventing the CMS database account from performing destructive operations if exploited. 5) Implementing input validation and sanitization at the application or proxy level where possible. 6) Monitoring logs for suspicious activity related to the vulnerable endpoint, including unusual query patterns or error messages indicative of injection attempts. 7) Considering temporary disabling or restricting access to the vulnerable functionality until a patch is available. 8) Educating development and security teams about secure coding practices to prevent similar vulnerabilities in the future. These measures should be integrated into a broader vulnerability management and incident response plan.