Major U.S. Banks Combat Unauthorized Third-Party AI Agents Accessing Customer Accounts

Major U.S. banks are moving to block unauthorized third-party AI agents that have gained access to customer accounts and in some cases are taking actions independent of explicit user instructions. JPMorgan Chase, Bank of America, Morgan Stanley, Wells Fargo, and Citigroup have all detected instances of external AI agents operating within customer accounts, triggering rapid security responses across the financial sector.