Published 05/11/2015 at 12:15 GMT | Updated 05/11/2015 at 18:13 GMT
The prosecutor said the Real Madrid star has been charged with "complicity in attempted blackmail and participation in a criminal association planning an offence punishable by at least five years imprisonment (in this case blackmail).”
Benzema, 27, is not allowed to have any contact with Lyon midfielder Valbuena after being charged.
Neither man was included in France's squad to face England and Germany in upcoming friendlies on Thursday.
Cisse was released after being questioned by police but Benzema was referred to the investigating judge in the Versailles courthouse after spending the night in custody.
News agency AFP says Benzema, who plays with Valbuena for the France national team, emerged from the headquarters of the judicial police at Versailles at around 9am CET on Thursday.
French footballer Karim Benzema (C), wearing a white hooded jersey, arrives at the police station in Versailles
Image credit: AFP
"Karim Benzema was taken to the courthouse to be brought before a judge who will decide later on in the procedure," said a public prosecutor. "The judge will decide at the end of this presentation the status of Karim Benzema in the procedure, particularly his possible indictment or his placement under the status of assisted witness."
AFP are reporting that Benzema has recognised that he intervened in the blackmail affair and now the striker has been formally charged.
Karim Benzema's lawyer Sylvain Cormier answers questions to journalists in front of the Versailles courthouse
Image credit: Reuters
What is Benzema's alleged involvement?
A source close to the investigation divulged information to AFP. The source said:
Karim Benzema has recognised that he intervened with Valbuena at the request of a childhood friend approached by three crooks who had a sex tape in their possession. He said that he agreed with a childhood friend about what he would say in order that his team-mate would negotiate exclusively with him.
AFP also adds that Benzema said he wanted to help his friend without thinking that he was doing wrong by Valbuena. Benzema is thought to have discussed the matter with Valbuena in October when France met up for matches against Armenia and Denmark.
Karim Benzema - France - Armenia - 08/10/2015
Image credit: AFP
What does this mean for France?
Benzema has been prohibited from meeting with the victim, his team-mate Valbuena, and both men have been excluded from the France squad named by Didier Deschamps, even if Benzema was injured in any case.
So eight months before Euro 2016 takes place on French soil, Les Bleus are without their star striker and an important squad member for two important preparatory games. As hosts, France did not play any qualifying matches so the two matches against Germany and England are key to their preparation.