[wp-trac] [WordPress Trac] #39550: Non-image files with the application/octet-stream mime type cannot be uploaded

[WordPress Trac]

#39550: Non-image files with the application/octet-stream mime type cannot be
uploaded
---------------------------+-----------------------------
 Reporter:  greatislander  |      Owner:
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Upload         |    Version:  trunk
 Severity:  normal         |   Keywords:
  Focuses:                 |
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 Since [39831], a valid Word document (with the `.docx` extension) which
 has the `application/octet-stream` mime type can no longer be uploaded as
 the comparison in [https://core.trac.wordpress.org/browser/trunk/src/wp-
 includes/functions.php?rev=39831#L2324 this block] will fail.

 A Word document can end up with this mime type when downloaded from a web
 server (this happens on GitHub, and I'm sure many other places) or when
 exported from an application other than Microsoft Word (e.g. Apple Pages,
 macOS 10.12).

 There are certainly security considerations around modifying this
 behaviour, but as it stands, this change appears to be a regression from
 earlier versions, as many valid files can no longer be uploaded.

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