What is Interactive Application Security Testing (IAST)? | Harness Blog

Interactive Application Security Testing (IAST) identifies vulnerabilities in running applications by deploying runtime agents that track data flows from user inputs through code, databases, and outputs, allowing it to detect issues such as SQL injection, cross-site scripting, and insecure deserialization with detailed code-level context. Usually run during QA, functional testing, or staging, IAST complements Static Application Security Testing (SAST), which analyzes code without execution; Software Composition Analysis (SCA), which detects vulnerable dependencies; and Dynamic Application Security Testing (DAST), which probes applications externally. Its real-time visibility can reduce false positives, improve remediation speed, and integrate security checks into existing automated test cycles, but it requires agent installation, supported languages and frameworks, sufficient test coverage, and operational effort to maintain across distributed microservices environments. IAST is therefore most effective as part of a layered application security program, alongside SAST and SCA early in development and DAST for external-facing testing.

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