Former White House chief strategist and Trump campaign CEO Steve Bannon is the unidentified "high-ranking Trump campaign official" in special counsel Robert Mueller's indictment of Roger Stone, CNBC has learned.

The indictment released Friday said the campaign official reached out to Stone in October 2016, a month before President Donald Trump was elected, "about the status of future releases by Organization 1." The unidentified organization clearly refers to WikiLeaks and Julian Assange.

Bannon is the campaign official, according to a person with direct knowledge of the matter.

This person, who declined to be named, added that Bannon has spoken with Mueller's team, along with the Senate Intelligence Committee, about the exchange.