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As of November 12, 2020, https://www.parisaeroport.fr/passagers/les-vols/covid-19-informations-voyageurs :
Passagers en correspondance à Paris
Les aéroports parisiens sont ouverts et accueillent les passagers en correspondance entre deux vols.
Vous devez vous assurer avant votre départ de l'aéroport d'origine de disposer du test de moins de 48h ou 72h exigé selon le pays de destination finale.
Passengers connecting in Paris
Parisian airports are open and welcome passengers connecting between two flights.
You must ensure before your departure from the airport of origin that you have the required test of less than 48 hours or 72 hours depending on the country of final destination.
It seems you are requested to present a negative PCR test if your end destination requires it.