Knowing the user registration email is possible to send fake messages / chat to facebook users. The only thing required is a fake mail with as the sender the victim registration email addressed to the facebook ids followed by "@facebook.com "
Example: from [email protected] to [email protected], [email protected]. .. Sent email will be shown in Facebook like a private message (or chat if multiple recipients are specified) sent by the Facebook account of the victim. (Previously reported vulnerabilities to Facebook) Matteo Fabbri
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