The vulnerability stems from missing authorization checks on user-controlled resource IDs in customer-facing endpoints. Based on the issue report's reproduction steps and affected routes (/addresses/edit, /reviews/delete, /orders/view), the corresponding controller methods likely directly use user-provided IDs (item_value) to perform operations without verifying resource ownership. This matches the CWE-639 pattern where user-controlled keys enable authorization bypass. Confidence is high due to the specific endpoint-to-controller mapping in Laravel applications and the vulnerability's reproducibility through ID manipulation.