Advanced Notice: Amazon S3 will automatically enable S3 Block Public Access and disable access control lists for all new buckets starting in April 2023

Starting in April 2023, Amazon S3 will introduce two new default bucket security settings by automatically enabling S3 Block Public Access and disabling S3 access control lists (ACLs) for all new S3 buckets. Once complete, these defaults will apply to all new buckets regardless of how they are created, including AWS CLI, APIs, SDKs, and AWS CloudFormation. These defaults have been in place for buckets created in the S3 management console since the two features became available in 2018 and 2021, respectively, and are recommended security best practices. There is no change for existing buckets.

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