Common IAM Permission Mistakes and Security Best Practices

An AWS developer outlines frequent IAM permission errors and lessons learned. Using overly broad permissions, such as allowing all actions on all resources, solves immediate access issues but creates significant security risks. The recommended approach is to grant only the specific permissions required for a task, like allowing s3:PutObject only on a designated bucket. Developers should also prefer IAM roles over embedded credentials for applications and systematically debug policies by checking both actions and resource ARNs.