Documents for trade talks between Britain and the United States, which expired before the general elections in 201
The documents were published online and used by Labor in the 2019 campaign to claim that the NHS would be at risk.
The UK government has said that the Russians are almost certainly seeking to interfere in the elections through documents.
A criminal investigation into the leak is under way.
A spokesman for the National Crime Agency confirmed that he was leading the investigation, but added that he could not comment further.
Mr. Fox was Minister of International Trade from July 2016 to July 2019.
It is not clear when his account was accessed and the information was stolen.
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Reuters, which first reported the story, said hackers had accessed Mr Fox’s account repeatedly between July 12 and October 21 last year.
A government spokesman said: “A criminal investigation is currently underway into how the documents were obtained and it would be inappropriate to comment further at this time.
“But as you would expect, the government has very robust systems to protect the IT systems of officials and employees.”
A spokesman for the National Cyber Security Center said he was working closely with lawmakers and political parties to offer them “the best guidance and support for cybersecurity.”
“We have been working closely with political parties for several years on how to defend ourselves against cyberattacks – including posting advice on our website.
“There is currently a criminal investigation and it would be inappropriate to comment further at this stage.”