The breach began with one account having more access than it needed. That single excess permission opened the door. Under FINRA compliance rules, that door should never have existed.
Least privilege is not optional. It is a core FINRA expectation for any firm handling sensitive financial data. The rule is simple: every user, service, and process gets only the permissions required to perform its function—no more. This minimizes the attack surface, satisfies regulatory requirements, and reduces human error.
FINRA compliance least privilege controls must be precise. They start with a clear inventory of all roles and systems. Map every API call, database query, and admin action to a specific job function. Remove rights that are not explicitly necessary. Review and update these permissions on a fixed schedule, especially after personnel changes or software updates.
High-level access accounts are under constant risk. FINRA audits often focus on whether privileged roles have been over-provisioned. An internal policy should specify exactly which roles can request escalations, for how long, and under what conditions. Automated revocation after task completion is not just best practice—it is evidence of compliance.