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If you view the Confluence page source through the Source Editor plugin, you'll see something weird: the 'Unknown Attachment' isn't Confluence saying "hey, there's no attachment by this name any more". It is in fact an embedded image of the 'unknown-attachment' image:
How does this happen?
I've seen this on a few Confluence instances, and I have no idea how pages get to be like this. I suspect there is copy and pasting going on. Another weird thing: the URL is 'http://', not 'https://'.
This is a result of a bug in the Confluence collaborative editor:
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Am I affected?
To see if any of your Confluence's pages are affected by this, run this SQL on the database (Postgres-flavoured):
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