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Agentic AI’s ‘step change’ poses systemic cyber risks – Breeden

Supervisors should stress-test multi-firm disruptions as models evolve, BoE deputy governor says

Sarah Breeden speaking at the ECB Forum in Sintra, Portugal on June 30, 2026
Sarah Breeden
Sérgio Garcia/ECB

Agentic artificial intelligence has undergone a “step change” in capabilities that could threaten cyber resilience in the financial system, the Bank of England’s deputy governor for financial stability has said.

Speaking today (June 30) on a panel at the European Central Bank’s conference in the Portuguese resort of Sintra, Sarah Breeden said her “most proximate” financial stability concerns regarding AI related to this change in capability. Supervisors, she added, would need to adopt a system

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