Introduction: The Critical Security Risk of Publicly Accessible Cloud Storage Buckets

The Cloud Exposure Index 2026 reveals a critical vulnerability: 484,142 publicly accessible cloud storage buckets across major platforms— Amazon S3, Microsoft Azure, Google Cloud Storage, DigitalOcean Spaces, and Alibaba Cloud OSS —currently expose 18 billion files to unauthorized access. Among these, 80,495 .env files , which store sensitive configuration data such as API keys and database credentials, were identified. Alarmingly, two-thirds of these .env files were created in 2026 , underscoring the accelerating nature of this risk.…