[wp-trac] [WordPress Trac] #57284: IMG tag in Custom HTML widget and also in post made w/ Classic Editor causes 404 on save/update

[WordPress Trac]

#57284: IMG tag in Custom HTML widget and also in post made w/ Classic Editor
causes 404 on save/update
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 Reporter:  blakespot    |       Owner:  (none)
     Type:  defect       |      Status:  new
  (bug)                  |
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Widgets      |     Version:  6.1.1
 Severity:  major        |  Resolution:
 Keywords:               |     Focuses:  javascript, administration, rest-
                         |  api
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Changes (by blakespot):

 * Attachment "Screenshot 2022-12-06 at 10.45.42 AM.png" added.

 Screenshot of frozen Custom HTML widget attempting to save content, and
 the inspector console showing the JS error due to IMG tag

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Ticket URL: <https://core.trac.wordpress.org/ticket/57284>
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