Is it possible to export Security Hub findings to a csv file?

Hello,

Currently there is no inbuilt feature to export Security Hub findings in CSV format.

Workaround-

You may follow this Blog to export those findings to comma separated values (CSV) formatted files in an Amazon Simple Storage Service (Amazon S3) bucket - https://aws.amazon.com/blogs/security/how-to-export-aws-security-hub-findings-to-csv-format/