On their Cassilis mission, Jelena found a little device that could hack through any security systems. Roan tested it by turning on every security system he could on his ship, but then easily opening it with the device. It belonged to the bald women who attacked us; she dropped it when we were meeting with Volun and passed through, since it is impossible to remove from whatever it is opening when it is on.
Ush was implying that that was what the Lady and her cohorts used to get inside your base.