The Problem: Third-Party Code Risk Modern apps are built on layers of third-party code—SDKs, libraries, plugins, and now mini-apps. Each integration point is a potential security vulnerability. When you let external code run inside your application, you're essentially handing over keys to your digital house. Figure 1: Modern Supply Chain Attack Landscape The 2020 SolarWinds breach affected 18,000 organizations. The 2021 Log4j vulnerability impacted millions of applications. These weren't attacks on the core application—they were attacks on dependencies. The question isn't if third-party code will cause problems—it's when. This is where sandboxing becomes essential. What Exactly is a Sandbox? The concept of a sandbox in computing is directly derived from a child’s physical sandbox. In this analogy, the physical sandbox represents the sandboxed environment, while the wooden frame surrounding it acts as the security boundary.…