The personal email of Christopher Kojm, the chairman of the US National Intelligence Council (NIC) was hacked by the notorious hacker known as Guccifer.
Guccifer's previous exploits included compromising the email account of a former White House aide, Sidney Blumenthal, and releasing sensitive memos allegedly sent to the former Secretary of State Hillary Clinton.
In this latest hack, Guccifer has sent screenshots of Kojm's personal msn.com email address to the website The Smoking Gun, which has validated the content and believes it was obtained within the past week, RT reported.
According to TSG, the hacker gained access to Kojm's personal correspondence, banking information, Obama administration transition material as well as e-mail exchanges with 9/11 Commission members and staff.
Based on the evidence provided there did not appear to be any classified information divulged.
Guccifer's prior hacks include compromising the email accounts of famed journalist Carl Bernstein, "Sex And The City" author Candace Bushnell and various prominent political figures.