OWASP Periodic Table of Vulnerabilities - Insufficient Authentication/Authorization
Root Cause Summary
Incorrect verification of identity and permissions can results to an attacker accessing sensitive data or functionality without properly being authenticated and/or authorized to do so.
Browser / Standards Solution
Whenever possible, apply server-side Access Control Lists for those sections of sensitive data that should't be publicly accessible.
Generic Framework Solution
Use an authentication framework.
Deny all access by default, and explicitly grant access per item.
Custom Framework Solution
Generate easy configurable role-based authentication and authorization policies.
Apply least-privilege principle to all transactions, requiring authentication and authorization wherever applicable.
Custom Code Solution