Facebook Messenger bug made it possible for hackers to see who you have been chatting with

Graham Cluley writes:

A security researcher has revealed details of a flaw in Facebook Messenger that made it possible for “any website to expose who you have been messaging with.”

Imperva’s Ron Masas, who in the past has identified a bug that allowed unauthorised websites to view Facebook users’ location histories, likes and interests, discovered the flawin the web version of Facebook Messenger.

Masas discovered a way of exploiting the Messenger website’s use of iFrames to determine who users had been chatting with.

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