[wp-trac] [WordPress Trac] #46282: Dotx uploading fails, even added to upload_mimes filter

[WordPress Trac]

#46282: Dotx uploading fails, even added to upload_mimes filter
--------------------------+-----------------------------
 Reporter:  kisabelle     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Upload        |    Version:  5.0.3
 Severity:  major         |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 {{{
 function custom_upload_mimes ( $mime_types ) {
   $mime_types['dotx'] = 'application/vnd.openxmlformats-
 officedocument.wordprocessingml.template';
   return $mime_types;
 }
 add_filter('upload_mimes', 'custom_upload_mimes');
 }}}


 Even when added using the upload_mimes filter, MS Word Letterhead .dotx
 files fail to upload with the following error:

 `Sorry, this file type is not permitted for security reasons.`

 The only way to successfully upload is to allow unfiltered uploads.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46282>
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