Issue #3163733 by stefanos.petrakis, navaneeth_r: CSV Mime type recognized as plain/text

Stefanos Petrakisrequested to merge
issue/file_upload_secure_validator-3163733:3163733-csv-mime-type into 7.x-2.x

Closes #3163733

Essentialy a backport of #3017358

Edited by Stefanos Petrakis

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