CVE-2025-40716 is a critical SQL injection vulnerability affecting versions prior to 4.7.0 of the Quiter Gateway product, which is a Java WAR application running on Apache Tomcat. The vulnerability arises from improper neutralization of special elements used in SQL commands (CWE-89) within the suceso.contenido mensaje parameter in the /QMSCliente/Sucesos.action endpoint. This flaw allows unauthenticated remote attackers to execute arbitrary SQL commands against the backend database without any user interaction, enabling them to retrieve, create, update, or delete data. The vulnerability has a CVSS 4.0 base score of 9.3, indicating a critical severity level, with attack vector network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (VC:H, VI:H, VA:H). The absence of authentication or user interaction requirements makes this vulnerability highly exploitable remotely. The affected product is a Java-based web application deployed on Apache Tomcat, which is commonly used in enterprise environments. The vulnerability could lead to full compromise of the underlying database, data leakage, unauthorized data manipulation, and potentially pivoting to further internal network compromise. No known exploits are currently reported in the wild, but the critical nature and ease of exploitation make it a high-risk threat that requires immediate attention. The lack of available patches at the time of publication further increases the urgency for mitigation.

For European organizations using Quiter Gateway, this vulnerability poses a significant risk to data confidentiality, integrity, and availability. Exploitation could result in unauthorized access to sensitive business data, customer information, and internal records, leading to data breaches and regulatory non-compliance, especially under GDPR requirements. The ability to modify or delete data could disrupt business operations, cause financial losses, and damage organizational reputation. Since the vulnerability requires no authentication and no user interaction, attackers can remotely exploit it at scale, increasing the risk of widespread attacks. Organizations in sectors such as finance, healthcare, government, and critical infrastructure that rely on Quiter Gateway for data processing or integration are particularly vulnerable. The potential for attackers to leverage this vulnerability to gain deeper network access could also facilitate ransomware deployment or other advanced persistent threats, amplifying the impact on European enterprises.

Immediate mitigation steps include: 1) Applying any available patches or updates from Quiter as soon as they are released, specifically upgrading to version 4.7.0 or later. 2) If patches are not yet available, implement web application firewall (WAF) rules to detect and block SQL injection attempts targeting the /QMSCliente/Sucesos.action endpoint, focusing on the suceso.contenido mensaje parameter. 3) Conduct thorough input validation and sanitization on all user-supplied data, especially parameters that interact with SQL queries, to neutralize special characters and prevent injection. 4) Employ parameterized queries or prepared statements in the application code to avoid direct concatenation of user input into SQL commands. 5) Restrict database user privileges for the application to the minimum necessary, limiting the potential damage from exploitation. 6) Monitor logs and network traffic for unusual database queries or access patterns indicative of exploitation attempts. 7) Consider isolating the Quiter Gateway application in a segmented network zone to limit lateral movement if compromised. 8) Conduct security awareness and incident response preparedness to quickly detect and respond to potential exploitation.