diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 87f3fec895..8df5788119 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -2933,6 +2933,7 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 				array(
 					'text/plain',
 					'text/csv',
+					'application/csv',
 					'text/richtext',
 					'text/tsv',
 					'text/vtt',
@@ -2943,6 +2944,21 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 				$type = false;
 				$ext  = false;
 			}
+		} elseif ( 'application/csv' === $real_mime ) {
+			// Special casing for CSV files.
+			if ( ! in_array(
+				$type,
+				array(
+					'text/csv',
+					'text/plain',
+					'application/csv',
+				),
+				true
+			)
+			) {
+				$type = false;
+				$ext  = false;
+			}
 		} elseif ( 'text/rtf' === $real_mime ) {
 			// Special casing for RTF files.
 			if ( ! in_array(