https://bugzilla.wikimedia.org/show_bug.cgi?id=30192

--- Comment #6 from Russ Nelson <[email protected]> 2011-08-03 23:59:37 UTC 
---
An attacker could use this to redistribute an image. Upload image A.jpg. Make a
thumbnail of it one pixel smaller than the original, 1023px-A.jpg. Overwrite it
with a copyright violation. Record the archived thumb name. Complain about the
copyright violation and ask for it to be deleted. A.jpg gets deleted, but
1023px-A.jpg remains at its archived URL, but is not in the database.

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