I can confirm that this hack took place through FTP access.
That means it was not a mal-configured server or vBulletin's fault.
How the strong FTP password was cracked is another question. It was an account created specfically for a past vBulletin contractor. Either the password was brute-force guessed (which I don't suspect), or the contractor's machine or FTP communication with our server was compromised.
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