Question from last Interview
"How can personal data protection mechanisms be bypassed in a system?"
📌 Correct Answer:
Protection is often implemented formally — and breaks at the logic level rather than at the cryptographic level.
Common bypass techniques:
— UI masking ≠ real protection
The frontend hides data (****), but the API returns everything → intercept the request and retrieve sensitive data
— Broken Access Control (IDOR)
Modify user_id → access other users’ data
Classic example:
/api/user?id=123 → /api/user?id=124
— Excessive data exposure in API responses
The frontend only needs an email, but the backend returns: passport, phone number, address
→ data is already exposed without exploitation
— Improper role-based access control (RBAC)
A low-privileged user can call admin-level methods
→ protection exists but is ineffective
— Logs and debug data leakage
Sensitive data appears in logs, stack traces, or error responses
→ sometimes triggering an error is enough
— Test environments (dev/staging)
Production data with weak security controls
→ easier access, same sensitive data
— XSS → full bypass
If XSS exists, attackers can read data from DOM/API on behalf of the user
📌 Strong Answer (concise):
“Most often, personal data protection is bypassed via IDOR, excessive data exposure in APIs, and UI-only masking. Data leaks are also commonly found in logs and test environments. If XSS is present, it typically results in full access to user data.”
