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To tackle the continuously changing threat landscape, it is recommended to adopt preventive approaches in the initial stages of application development to help reduce the attack surface and prevent inherent design flaws. Some commonly embraced security controls encompass secure design patterns, threat modeling, and reference architectures that help mitigate application vulnerabilities in earlier stages of the software development lifecycle. An insecure design flaw is an application security risk that arises from the lack of effective implementation of these security controls. This guide discusses insecure design vulnerabilities, their types, severity level, and best prevention practices.