CVE-2026-1478 identifies a critical out-of-band SQL injection (OOB SQLi) vulnerability in the Quatuor Evaluación de Desempeño (EDD) application, specifically in the parameters 'Id_usuario' and 'Id_evaluacion' within the '/evaluacion_hca_evalua.aspx' page. This vulnerability stems from improper neutralization of special elements in SQL commands (CWE-89), allowing attackers to inject malicious SQL code. Unlike traditional in-band SQLi, OOB SQLi enables attackers to extract data through external communication channels, such as DNS or HTTP requests, without the application directly returning the data. This technique can bypass some detection mechanisms and complicates incident response. The vulnerability requires no authentication or user interaction, making it highly accessible to remote attackers. The CVSS 4.0 score of 9.3 reflects its critical severity, with network attack vector, low attack complexity, and no privileges or user interaction needed. The vulnerability compromises confidentiality primarily, with high impact on integrity and availability as well. No patches are currently available, and no known exploits have been reported in the wild, but the risk remains substantial due to the nature of the flaw and the sensitive data potentially exposed. The affected product is used primarily in performance evaluation contexts, likely within organizational or governmental environments, increasing the potential impact on sensitive personnel or operational data.

The exploitation of this vulnerability can lead to unauthorized disclosure of sensitive information stored in the backend database, including potentially personal, performance, or evaluation data. This breach of confidentiality can result in privacy violations, regulatory non-compliance, and reputational damage. Additionally, attackers might leverage the vulnerability to further compromise database integrity or availability, potentially disrupting organizational operations. Since the vulnerability is remotely exploitable without authentication or user interaction, it poses a high risk of widespread exploitation once publicly known or if exploit code is developed. Organizations relying on Quatuor EDD for performance evaluations, especially in sectors handling sensitive employee or operational data, face significant risks. The out-of-band nature of the SQLi complicates detection and mitigation, increasing the likelihood of prolonged undetected data exfiltration. This can also facilitate advanced persistent threats targeting strategic or governmental entities using this software.

1. Immediate implementation of web application firewalls (WAFs) with custom rules to detect and block suspicious SQL injection patterns targeting 'Id_usuario' and 'Id_evaluacion' parameters. 2. Employ strict input validation and sanitization on all user-supplied inputs, enforcing type checks and rejecting unexpected characters or patterns. 3. Restrict database user permissions to the minimum necessary, preventing unauthorized data access or modification. 4. Monitor outbound network traffic for unusual DNS or HTTP requests that may indicate out-of-band data exfiltration attempts. 5. Conduct thorough code reviews and security testing focusing on SQL query construction and parameter handling in the affected application module. 6. Prepare for rapid patch deployment once the vendor releases an official fix; maintain close communication with Quatuor for updates. 7. Consider deploying database activity monitoring tools to detect anomalous queries or access patterns. 8. Educate internal security teams about the specific nature of OOB SQLi to improve incident detection and response capabilities. 9. If feasible, isolate the affected application environment from critical network segments to limit potential damage.