AWS S3 Unauthorized Request Billing Issue: An Empty S3 Bucket Can Dramatically Increase the Costs
Briefly

By default, AWS doesn't log requests executed against your S3 buckets...observed thousands of write requests originating from multiple accounts or outside AWS.
The root cause was the default settings of an open-source tool, unintentionally targeting the same bucket name for backups, leading to unauthorized requests and financial implications.
Read at InfoQ
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