Reports say though the system which was hacked contained the president's private schedule, the international hack allegedly did not impact any classified information.
United States officials have said that Russia was behind the cyber attack on the White House which happened last year.
NBC reports that though the system which was hacked contained the president's private schedule, the international hack allegedly did not impact any classified information.
In a statement to the news channel, National Security Council spokesman Mark Stroh said the incident wasn't new and adequate security measures had been taken to prevent hackers from gaining access.
"This report is not referring to a new incident,it is speculating on the attribution of the activity of concern on the unclassified EOP network that the White House disclosed last year, any such activity is something we take very seriously. In this case, as we made clear at the time, we took immediate measures to evaluate and mitigate the activity"
According to NBC, the incident was confirmed by 2 different sources - one in law enforcement and another in the intelligence community, both of whom said no classified information was breached.
Sources say it is believed the Russians got into the system through State Department computers.
Meanwhile last week, President Barack Obama signed an executive order authorizing the first sanctions program against cyberattackers who pose a "significant threat" to American interests.