It's a new setting in vBulletin 3.5.0..
AdminCP -> vBulletin Options -> General Settings
Quote:
Post Referrer Whitelist
For security purposes, vBulletin only allows data to be submitted via post from within the domain the board is installed on. If you are submitting post requests from a different domain or subdomain, you must add them here.
Enter domains in the form of .domain.com (including the leading dot). Seperate multiple domains by line breaks.
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