Temporary attachments should only be viewable by the session/user which adds them

XenForo implements temporary attachments without additional constraints to view them, with the guest posting feature this sadly can be trivially exploited for spam:

BassMan said:
Or this one...

Upload images in the quick editor and never post a reply. Use the URL of those images in an email for various phishing attacks. The URL points to your forum (images are uploaded to your server).
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BassMan said:
I received a message about this with the URLs of the images via the contact form. And then the...
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