Misuse Case

A misuse case is a scenario that describes how a system could be exploited or attacked by malicious actors.

Unlike traditional use cases that outline legitimate user interactions with a system, misuse cases deliberately model harmful behaviors, vulnerabilities, and potential security breaches to help developers and security teams identify weaknesses before they can be exploited.

Misuse cases typically follow a structured format that includes the threat actor (who), their malicious goals (what), and the methods they might employ (how). For example, a misuse case might describe how an attacker could exploit a web application's login system through SQL injection or brute force attacks. These scenarios help security professionals think like adversaries and proactively design countermeasures.

The practice is particularly valuable in secure software development lifecycles, threat modeling exercises, and security architecture reviews. By systematically documenting potential attack vectors, organizations can prioritize security controls, conduct more effective penetration testing, and ensure that defensive measures address realistic threats rather than theoretical concerns.