TL;DR: We discovered that AWS services like SageMaker, Glue, and EMR generate default IAM roles with overly broad permissions—including full access to all S3 buckets. These default roles can be exploited to escalate privileges, pivot between services, and even take over entire AWS accounts. For example, importing a malicious Hugging Face model into SageMaker can trigger code execution that compromises other AWS services. Similarly, a user with access only to the Glue service could escalate privileges and gain full administrative control. AWS has made fixes and notified users, but many environments remain exposed because these roles still exist—and many open-source projects continue to create similarly risky default roles.