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Abstract
In this article, we present an experimental-quantitative study on vulnerabilities in modern web applications developed with Laravel, Django, and React. A replicable laboratory was built with VirtualBox and Docker, and OWASP ZAP and Burp Suite were applied, in which vulnerabilities were identified and validated before and after mitigations. The strategy followed good secure development practices (query parameterization, input validation, hardening HTTP headers, CORS control, and secure error handling). An average 67.3% reduction in the risk level and the elimination of critical findings were observed, which demonstrates the efficiency of integrating security into the SSDLC (Software Development Lifecycle). The proposed protocol, aligned with OWASP Top 10 (2021), ISO/IEC 27002:2022, and NIST SP 800-53, is replicable in academic and corporate environments.
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