Interactive Application Security Testing (IAST) works inside a running application. It listens, watches, and reports in real time. Unlike SAST or DAST, it runs with the app, mapping every function, input, and output as they happen. It doesn’t just catch known vulnerabilities—it detects dangerous behavior patterns before they unfold into production incidents.
IAST threat detection integrates directly into your testing stage. When a request hits your app, IAST traces the execution path, monitors data flow, and checks it against a library of vulnerability rules. SQL injection, cross-site scripting, insecure object references—they’re exposed instantly. This is continuous security at runtime, without slowing the build.
The strength of IAST is precision. Because it observes actual code execution, false positives drop sharply. You get actionable alerts on exploitable issues, not long lists of hypothetical ones. The tool sees how your custom logic interacts with frameworks, libraries, and external APIs, which traditional scanners often miss.