[wp-trac] [WordPress Trac] #64395: YouTube Embed block not working on Safari

[WordPress Trac]

#64395: YouTube Embed block not working on Safari
-----------------------------+-------------------------------------------
 Reporter:  alessandrolioce  |      Owner:  (none)
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Embeds           |    Version:  6.9
 Severity:  normal           |   Keywords:  has-test-info has-screenshots
  Focuses:                   |
-----------------------------+-------------------------------------------
 When embedding a YouTube video using the YouTube Embed block in the Block
 Editor, Safari (version 26.1 on macOS 26.1) displays the following error
 within the embedded player:


 {{{
 Error 153
 Video player configuration error
 }}}


 The same embed works correctly in Firefox 146 and Chrome 143 on macOS.

 According to the official YouTube documentation:
 [https://support.google.com/youtube/answer/171780?hl=en#zippy=%2Cprovide-a
 -http-referer-header-to-enable-video-playback]

 YouTube requires the embedded player to receive a valid HTTP Referer
 header.
 If the Referer is missing, playback may be blocked and Error 153 is
 displayed.

 Safari appears to be omitting the Referer in the embed request due to
 YouTube blocking, causing the issue.

 The issue occurs in the admin editor, but not in the frontend.

 **Steps to reproduce the problem:**
 - Log in to the WordPress admin with Safari
 - Create a new post using the block editor
 - Add the YouTube Embed block
 - Enter the URL [https://www.youtube.com/watch?v=182f6dTagkU]
 - Press the Embed button
 - The player displays error 153

 **Expected Behavior**
 The video preview should display correctly within the YouTube block.

 **Test Environment**
 • WordPress: 6.9
 • Theme: Twenty Twenty-Five v1.4
 • Active Plugins: None
 • Safari: 26.1
 • macOS: 26.1

 **Curl request without referrer**
 {{{
 curl "https://www.youtube.com/embed/182f6dTagkU?feature=oembed" \
   -X GET \
   -H "User-Agent: Mozilla/5.0" \
   -H "Accept-Language: en-US,it;q=0.9" \
   -H "Accept: text/html,*/*" \
 | grep --color=always -E "Video player configuration
 error|PLAYABILITY_ERROR_CODE_EMBEDDER_IDENTITY_MISSING_REFERRER|Error 153"
 }}}

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/64395>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform