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Re:Abusing JSONP with Rosetta Flash by simonw on Tuesday July 08, 2014 @12:27PM (#8005314)
That's due to an extremely complex (albeit easy to exploit) SWF reflection attack.

JSONP itself, though yucky, should still be safe from XSS given a /-star-star-/ prefix and a validated callback parameter.

Re:Abusing JSONP with Rosetta Flash by spacemanmatt on Tuesday July 08, 2014 @12:45PM (#8005402)
> given a /-star-star-/ prefix and a validated callback parameter.

I think that is the "waiting to happen" part of my initial comment.