Facebook corporate network hack discovered by security researcher

Penetration testing unearths backdoor installed on Facebook's company servers had been logging employee credentials and exposing security

Hackers gained entry to Facebook's internal corporate network for several months, with access to hundreds of the social network's employee usernames and passwords.

The hackers, which were actively exploiting Facebook's network in July and September last year and possibly as recently as February this year, were discovered by a security researcher performing penetration testing on Facebook's corporate network.