UN R155 addresses operator risks in automated driving systems. The ADS Regulation enables operators to offer services using automation and permits remote termination of the ADS. UN R155 mandates that supplier-related risks are managed, but operators are customers, not suppliers, creating downstream risks. An automated vehicle could be susceptible to unauthorised requests from an operator experiencing cyber attack. UN R155 does not define how downstream organisational risks are managed. Manufacturers should identify risks posed by operators and inform Third Party Operators of risks involved and expected minimum-security controls for workstations interfacing with an ADS. This could be achieved via Annex 5.