The woman in the case claimed Cuban reached inside her trousers and penetrated her vagina with his finger while they were posing for a picture in a Portland nightclub. The woman, who was not identified in the article, told Willamette Week, "I really left it in the past".
The allegations come weeks after Sports Illustrated's Jon Wertheim and Jessica Luther published an investigation that highlighted a "corporate culture rife with misogyny and predatory sexual behavior".
The unnamed accuser has alleged that the abuse went down in Portland in 2011, while the pair were posing for a photoshoot after a Dallas Mavericks away game.
The woman declined to proceed with the allegation at the time but she still contends he did what she accuses him of doing. "I stand behind that report 1,000%".
Cuban has denied the allegations.
A detective in the case described two of the photos as "significant" in his report, according to Willamette Week. More specifically, the alleged victim said Cuban "pushed his hand down the back of her jeans and inside her underwear where he cupped his hand over her groin area and inserted the tip of his finger into her vagina".
In his 2011 memo, Rees wrote that investigators interviewed friends of the woman with her at the nightclub as well as employees and other patrons. The woman appeared to have a "look of surprise and strain" in some of the photos, the officer noted.
Houze, Cuban's attorney, also gave authorities the results of a polygraph examination and the opinion of two medical experts that Rees said provided evidence against the woman's claims.
The report included claims of inappropriate sexual conduct by former CEO Terdema Ussery and raised questions about what Cuban knew and when.