Facebook Security Team have announced that they has been a victim of a sophisticated cyber attack last month. But unfortunately there were no issue of any users data content. This news has been published by the Facebook team on their blog Post.
The attack was discovered when the couple of the employees of the Facebook team have visited the mobile version and found the compromised site. The Java Zero-Day exploit was reported to the Oracle by the facebook, as soon as it was discovered. Now that has been patched.
Facebook also mentioned that it was not the only company targeted but they are the first to discover this attack.