Interactive Application Security Testing (IAST)

Interactive Application Security Testing (IAST)

IAST represents an evolution in dynamic testing, combining runtime analysis with code visibility. By instrumenting applications with sensors, IAST tools observe code execution during testing, providing precise vulnerability identification with full stack traces. This hybrid approach delivers the accuracy of SAST with the runtime validation of DAST.

IAST deployment models vary from agent-based to library integration. Agent-based IAST modifies application runtime behavior through JVM agents, .NET profiling APIs, or language-specific hooks. Library-based approaches integrate directly into applications through dependencies. Both models provide deep visibility into application behavior during testing.

The continuous monitoring capability of IAST enables security validation during all testing phases. Functional tests, integration tests, and manual QA testing all contribute to security coverage when IAST is active. This passive monitoring approach maximizes security testing coverage without requiring dedicated security test execution.