Read the actual article carefully. There is no proof of anything. Just the "word" of unnamed "U.S. officials"...
“Earlier this week, I met separately with (Director) FBI James Comey and DNI Jim Clapper, and there is strong consensus among us on the scope, nature, and intent of Russian interference in our presidential election,” CIA Director John Brennan said in a message to the agency’s workforce, according to U.S. officials who have seen the message.
“The three of us also agree that our organizations, along with others, need to focus on completing the thorough review of this issue that has been directed by President Obama and which is being led by the DNI,” Brennan’s message read.
The CIA and FBI declined to comment.
Did he actually say this? Maybe. Nobody really knows. It's called "FAKE NEWS" for a reason.