What Is Application Security Testing? SAST, DAST, and SCA Explained

Application security testing (AST) evaluates software for vulnerabilities across source code, running applications, open-source dependencies, containers, secrets, and APIs before and after release. Common approaches include SAST for code at rest, DAST for externally testing running applications, IAST for instrumented runtime testing, and SCA for dependency risks, with each method addressing different gaps. The material argues that the principal challenge is not finding vulnerabilities but prioritizing the relatively small share that are reachable and exploitable, since conventional tools can generate large volumes of false positives and rankings based only on CVSS severity may lack environmental context. Reachability analysis maps whether vulnerable functions can actually be invoked through an application’s code, dependencies, and deployment layers, helping teams focus remediation on meaningful attack paths. It also highlights risks from transitive dependencies and AI-generated code, including unsafe or nonexistent package recommendations, and recommends validating findings and dependencies with the same scrutiny applied to manually written code. Effective programs combine testing methods, integrate scans into CI/CD workflows, use exploitability and exposure alongside severity to prioritize work, support developers with safe upgrade paths or patches, and maintain evidence such as SBOMs and VEX records while retaining manual penetration testing for complex business-logic issues.

Use this post, company, and trend context to find content marketing opportunities, perform competitive analysis, or address product feature gaps via the Plushcap MCP server or the Plushcap API.