Cross-Application Security Risks

Micro Frontends offer great flexibility by breaking down monolithic applications. However, this modularity introduces unique security challenges when multiple independent applications collaborate.

Understanding how these separate pieces interact and what risks arise from their cross-application communication and shared environment is crucial for building secure systems.

The Same-Origin Policy (SOP) is a fundamental browser security mechanism. It prevents web pages from interacting with resources from a different origin (domain, protocol, port).

In Micro Frontends, even if all modules are on the same top-level domain, if they're on different subdomains or ports, SOP might treat them as distinct origins. Misconfigurations here can lead to unintended cross-origin access.