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Fix/csv import file validation #3003

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RabbiIslamRony wants to merge 4 commits into from
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Fix/csv import file validation #3003

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d0fbb4f
Merge pull request #2990 from sovware/development
Armanul46 Sep 2, 2026
b13b08c
fix: validate CSV imports with WordPress file checks
RabbiIslamRony Sep 8, 2026
942b738
fix: validate CSV files uploaded by WordPress importer
the-sohan Sep 9, 2026
6ecaf16
fix: support deduplicated WordPress CSV import names
the-sohan Sep 9, 2026
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26 changes: 14 additions & 12 deletions includes/classes/class-tools.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1123,19 +1123,21 @@ public static function validate_csv_file( $file ) {
return new WP_Error( 'invalid_csv_file', 'Invalid file path or file does not exists.' );
}

if ( ! wp_check_filetype( $file )['ext'] === 'csv' ) {
return new WP_Error( 'invalid_csv_file', 'The file must be a CSV file.' );
}
$filename = wp_basename( $file );

$mime_type = mime_content_type( $file );
if ( ! in_array( $mime_type, [ 'text/csv','text/plain', 'application/csv' ], true ) ) {
return new WP_Error(
'invalid_csv_file',
sprintf(
'Invalid file type. Only text/plain, text/csv, and application/csv are supported, given "%s".',
$mime_type
)
);
// WordPress appends .txt and may add a numeric suffix to importer uploads.
$filename = preg_replace( '/\.csv(?:-\d+)?\.txt$/i', '.csv', $filename );

$file_type = wp_check_filetype_and_ext(
$file,
$filename,
[
'csv' => 'text/csv',
]
);

if ( 'csv' !== $file_type['ext'] || 'text/csv' !== $file_type['type'] ) {
return new WP_Error( 'invalid_csv_file', 'The file must be a valid CSV file.' );
}

return $file;
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