Advertisement23andMe customer accounts were breached by hackers last year, but it took the DNA testing company five months to detect the intrusion. The company learned about the attack after stolen customer data was advertised on Reddit, as well as on the darkweb forum BreachForums, per the filing. The filing stated: "On October 10, we required all 23andMe customers to reset their password. 23andMe previously told Business Insider that the hackers gained access to customer data through " credential stuffing ." 23andMe didn't immediately respond to a request for comment from Business Insider, made outside normal working hours.

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