Threat Modeling Without a Security Team

You do not need a CISO to threat-model. The framework is teachable in a sprint.

Why most teams skip

Most teams without a security team skip threat modeling because it sounds like specialist work. The result: vulnerabilities discovered after, not before.

The framework is light enough for engineers to run on themselves.

The four questions

• Q1: What are you building? Architecture sketch; data flows.
• Q2: What can go wrong? STRIDE shorthand: spoofing, tampering, repudiation, info disclosure, DoS, elevation of privilege.
• Q3: What will you do about it? Mitigations per identified threat.
• Q4: Did you do a good job? Review with a colleague.

Sprint-cadence integration

One threat-modeling session per sprint, 30-60 minutes, on the most-impactful new feature.

Cumulative: most features get a model within a quarter.

Output format

Output: one-page document with the four questions answered. Linked from the design doc. Reviewed at sprint demo.

The output is communication, not compliance. Keep it light.

Antipatterns

• Threat modeling once a year. Code drifts faster than the doc.
• Threat modeling without engineers. Compliance theatre.
• One mega-document. Nobody reads.

What to do this week

Three moves. (1) Pick one production system to apply this pattern to first. (2) Measure the security signal before/after. (3) Document the gap and write a follow-up ticket so the program stays alive between quarterly reviews.