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Is it possible in a Real world scenario to exploit this type of XSS, I'm injecting the payload in the User agent header and it is executed on it's response page. Can I craft this request such that the victim gets the changed User agent header with the request?

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  • It would have to be stored, not reflected, if you want to exploit someone other than yourself.
    – Anders
    Jan 10 '18 at 14:16

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