Threat Modeling for Developers

Most security vulnerabilities are design problems, not implementation bugs. A perfectly coded feature that was designed without considering threats is still insecure. That is why every developer — not just security specialists — should know the basics of threat modeling.

The STRIDE framework is a good starting point: Spoofing, Tampering, Repudiation, Information Disclosure, Denial of Service, Elevation of Privilege. For every feature you build, walk through each category. What could an attacker do? What are you trusting that you should not trust?

Threat modeling does not need to be a formal process with diagrams and meetings. It can be as simple as spending ten minutes asking 'how could this be abused?' before writing code. That ten-minute investment prevents vulnerabilities that would take days to find and fix later.