Authentication is the checkpoint at the door. Authorization is the checkpoint at every room inside the building. Most breaches happen because the door guard was fine but the room guards were distracted, missing, or following inconsistent rules. This module is about why auth checks fail so reliably in real-world systems — and how attackers exploit the pattern, not individual bugs.
Why this happens
Authentication is a design decision made early and globally. Authorization is a design decision made late, per-feature, by different developers at different times. Every new endpoint is a new authorization decision. Every refactor is a new opportunity to drop a check. Every microservice split is a new trust boundary where old assumptions don’t carry over.
Developers conceptualize security as “logged-in or not” — the binary check of authentication. They don’t conceptualize “this specific user for this specific resource at this specific moment” — the contextual check of authorization. Frameworks often help with the first and barely help with the second. The result: consistent auth, inconsistent authz.
How it happens
Five patterns account for nearly all auth-related breaches:
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