Data minimization isn’t about cutting corners. It’s about cutting risk. Every unused field, every forgotten log, every over-collected attribute is an attack surface waiting to be exploited. DAST (Dynamic Application Security Testing) exposes insecure handling of this data in real time, but without a clear minimization strategy, you’ll keep finding the same kinds of vulnerabilities again and again.
At its core, DAST data minimization is the practice of reducing the amount of sensitive data processed, stored, or exposed while still meeting legitimate business needs. This isn’t theory — it’s one of the most effective ways to shrink the blast radius of any breach. You can’t leak what you don’t keep.
Start with a simple rule: collect only what’s required for the task at hand. Then ensure it’s stored briefly, encrypted at rest, and deleted automatically when no longer needed. Modern DAST tools can validate that your application is handling only minimal required data during runtime. This means tests don’t just flag vulnerabilities; they can also indicate unnecessary exposure of personally identifiable information (PII) and other high-value targets.