The fact behind the vulnerability which could give access to your FB account is- Facebook access token expires never. Ramadan shows an example (he checked the stolen FB access token in Facebook graph explorer and found it expires never.)
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Now have a look to vulnerabilities Ramadan found:
1. Ramadan found vulnerability in Facebook messenger & Facebook main app, he writes in his blog-an attacker needs to send an attachment like: a movie, doc, pdf, pic or any files that can be attached in Facebook messages, something like this through android app of Facebook. On click to download that attachment your Facebook access_token is leaked to android logcat which allows an android app to read and capture your Facebook access_token stealthy, that’s it you have been hacked.
- See more at: http://hackersnewsbulletin.com/2013/10/hacker-can-easily-hack-facebook-account-update-fb-smartphone-app-now.html#sthash.ytMHQ4sU.dpuf
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