Last year, security researcher Jamal Eddine discovered a Foursquare bug that could have been exploited to obtain the primary email addresses of all Foursquare accounts. The privacy issue was addressed quickly by the social network, but the expert only published his findings a few days ago.
The flaw was found in the invitations sent out by users when they wanted to befriend someone. The URL in the friend request contains a parameter called uid, which is associated wit…
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