[wp-trac] [WordPress Trac] #39550: Some Non-image files fail to upload after 4.7.1

[WordPress Trac]

#39550: Some Non-image files fail to upload after 4.7.1
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 Reporter:  greatislander  |       Owner:  joemcgill
     Type:  defect (bug)   |      Status:  assigned
 Priority:  normal         |   Milestone:  4.7.2
Component:  Upload         |     Version:  trunk
 Severity:  normal         |  Resolution:
 Keywords:  needs-patch    |     Focuses:
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Comment (by greatislander):

 Replying to [comment:41 mensmaximus]:
 > The deeper I dig into this the more I feel checking the real mime type
 for security reasons wont work well. As soon as a file or http stream does
 not provide a mime type it will be set to application/octet-stream (server
 side fallback).

 This conclusion was the basis of my initial report. Even exporting a Word
 document from Apple Pages sets the wrong mime type, causing this check to
 fail. It would be ideal to have a more secure upload validation method but
 the way mime types are set (often incorrectly) on various systems and in
 various contexts makes it hard to get reliable results.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39550#comment:43>
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