CVE-2026-1476 identifies a critical SQL injection vulnerability classified under CWE-89 in the Quatuor Evaluación de Desempeño (EDD) application, a performance evaluation software developed by Gabinete Técnico de Programación. The vulnerability is an out-of-band (OOB) SQL injection, which means that the attacker can exploit the 'Id_usuario' parameter in the '/evaluacion_acciones_ver_auto.aspx' endpoint to execute arbitrary SQL commands that do not return data directly through the application’s normal response channels. Instead, the attacker leverages external communication channels to extract sensitive information from the backend database, bypassing typical detection methods. This form of injection is particularly dangerous because it can evade traditional input/output monitoring and logging. The vulnerability affects all versions of the product, indicating a systemic flaw in input handling. The CVSS 4.0 score of 9.3 reflects the vulnerability’s high impact and ease of exploitation: it requires no privileges, no user interaction, and can be exploited remotely over the network. The vulnerability compromises confidentiality primarily, with high impact on integrity and low impact on availability. No patches are currently available, and no known exploits have been reported in the wild, but the risk remains significant due to the critical nature of the flaw and the sensitive data typically handled by performance evaluation systems.

For European organizations, the exploitation of this vulnerability could lead to unauthorized disclosure of sensitive employee or organizational data stored within the EDD application’s database. This can result in severe confidentiality breaches, potentially exposing personal data protected under GDPR, leading to legal and financial penalties. The integrity of performance evaluation data could also be compromised, undermining trust in HR processes and decision-making. Since the vulnerability allows remote exploitation without authentication, attackers could operate from outside the network perimeter, increasing the risk of widespread attacks. Public sector entities and large enterprises using Quatuor’s EDD system are particularly at risk, as they often hold extensive personal and operational data. The lack of direct data return in the attack vector complicates detection and forensic analysis, potentially allowing prolonged undetected data exfiltration. This could also facilitate further attacks by revealing database schema or credentials. Overall, the impact includes data breaches, reputational damage, regulatory fines, and operational disruption.

Organizations should immediately implement strict input validation and sanitization on the 'Id_usuario' parameter and any other user-supplied inputs within the EDD application. Employing parameterized queries or prepared statements is essential to prevent injection attacks. Network-level monitoring should be enhanced to detect unusual outbound traffic patterns indicative of OOB SQL injection exploitation. Deploy Web Application Firewalls (WAFs) with updated rules to block suspicious SQL payloads targeting the vulnerable endpoint. Since no official patches are available, consider isolating the application from direct internet exposure and restricting access to trusted internal networks only. Conduct thorough code reviews and security testing to identify and remediate similar injection points. Maintain comprehensive logging and alerting to detect anomalous activities. Engage with the vendor for timely patch releases and apply updates as soon as they become available. Additionally, perform regular security awareness training for developers and administrators on secure coding practices and vulnerability management.