OWASP A03 and A04: Why Supply Chain and Cryptographic Risks Go Beyond Your Own Code

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Security researcher Samyuktha published a technical walkthrough exploring two OWASP Top 10 categories — A03 (Software Supply Chain Failures) and A04 (Cryptographic Failures) — and how they apply to real-world web applications. A03 focuses on risks introduced through third-party dependencies, build pipelines, and unverified components, with the SolarWinds breach cited as a prominent example of supply chain compromise. A04 extends beyond broken encryption algorithms to cover how sensitive data is handled in transit, storage, cookies, and API responses. The author applied these concepts to an authorized web application, examining client-side resources, login flows, and storage mechanisms without performing any destructive testing. A key takeaway is that security failures in both categories often stem from poor practices around dependency management and data handling, not just flawed code written in-house.

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