Unvetted AI agents infiltrate U.S. bank accounts, forcing access blocks

Major U.S. banks, including Morgan Stanley and Bank of America, are detecting unauthorized third-party AI agents operating inside customer accounts, some acting independently of user instructions. Banks are responding by blocking the technology and rewriting terms of service, highlighting a widening gap between AI adoption and financial-sector security controls. The scope of compromise and the agents' capabilities remain unclear, but the incident signals a novel threat vector in banking cybersecurity.

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