How to Catch the Top OWASP 2021 Security Category - Broken Access Control - in Code Review

This article provides practical guidance for catching Broken Access Control issues during code review, illustrating common patterns such as missing or inconsistent checks, parameter tampering, insecure scoping between endpoints, and session/token handling problems using Rails examples (e.g., `index`, `show`, `DELETE`). It advises reviewers to check for least-privilege violations, ensure consistency across endpoints, validate parameters instead of trusting client-supplied values, and pay special attention to edit/update/delete actions and session management.