In a sworn testimony, the woman accused Greitens of forcing her into a "bear hug" and putting her on the floor when she attempted to leave his basement in 2015, Politico news quoted the 25-page report as saying on Wednesday night.
She testified that Greitens then forced her a sexual encounter while she was crying "uncontrollably", the report said.
The report was released by a special committee of the Missouri House of Representatives, which convened to investigate Greitens after he was indicted in February on a charge of invasion of privacy for allegedly taking a non-consensual nude photo of the woman.
The woman's former husband has also alleged that Greitens, a Republican in his first term, threatened to blackmail her with the photo.
Greitens has admitted to the affair but denied that he ever tried to blackmail the woman.
Ahead of the document's release, Greitens said at a press conference that the report would include only "lies and falsehoods" and repeatedly bashed the investigation against him as a "political witch hunt", Politico reported.
Greitens stepped down from his position on the Republican Governors Association's executive committee and has kept a much lower profile.
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