Ensure your S3 buckets are only allowing access to other accounts within your organization

Ensure that your S3 buckets that allow access from other accounts, only allow traffic from accounts within your organization that you trust. This is considered a security best practice and should always enabled on every bucket. Ensuring this is enabled will help with NIST,PCI-DSS, HIPPA and GDPR compliance.

Audit & Remediation



  • Select the Name hyperlink for the S3 bucket you would like to check.
  • Under Permissions select Bucket Policy.



  • If there is a policy defined, validate if you see account numbers specified as a principle:
    "Version": "2012-10-17",
    "Statement": [
            "Effect": "Allow",
            "Principal": {
                "AWS": [
            "Action": [
            "Resource": "arn:aws:s3:::my-bucket-logging/*",
  • Remove any accounts that are not a part of your organization or a trusted account. Example: arn:aws:iam::012345678999:root
  • Press the save button to save the policy.
  • Repeat the outlined steps for each S3 bucket that you have.
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