What is the role of test automation in security testing?

While tooling costs exist, automation typically reduces long-term cost and time for repeatable tests, making cost alone an inaccurate and misleading characterization.

Manual security testing remains essential for exploratory testing, threat modeling, and uncovering logic flaws that automated scanners are incapable of detecting.

Test automation is widely and successfully used in security testing for vulnerability scanning, DAST, and compliance checks, and is not precluded by test complexity.

Automated security testing tools excel at executing consistent, repeatable scans and benchmark tests at speed, eliminating human variability in routine checks. However, automated tools cannot replicate the creative reasoning required for tasks such as threat modeling, logic flaw discovery, or complex multi-step attack simulation, which require human judgment. A mature security testing program combines both automation and manual techniques.