What is the role of test automation in security testing?

Test automation is generally cost-effective once configured because it eliminates repetitive manual effort at scale - the claim that it is prohibitively expensive is not accurate as a general rule.

Exclusive reliance on automated testing is insufficient because tools cannot detect all vulnerability classes, especially logic flaws and novel attack paths that require contextual human reasoning.

Test automation is widely applicable and practical in security testing for activities like vulnerability scanning, fuzzing, and regression checks - characterizing it as unusable due to complexity is incorrect.

Automated security testing tools excel at executing predefined test cases rapidly and repeatably with a consistent configuration, making them well-suited for regression scanning and benchmark comparisons. However, automated tools cannot reason about application logic, novel attack chains, or context-dependent vulnerabilities the way a skilled human tester can. A mature security testing program combines automation for speed and consistency with manual techniques for depth and creative coverage.