In a letter to bank CEOs, ECB chief supervisory officer Claudia Buch required
lenders to submit action plans by end-October to address rising cybersecurity
threats from advanced AI models, citing examples such as Anthropic’s Claude and
Mythos. Buch urged faster software patching, strengthened AI-driven cyber
defenses, tighter oversight of third-party vendors and long-term infrastructure
modernization. ECB President Lagarde last month warned AI could trigger a
financial crisis and said CEOs must ensure readiness and recognize the need for
substantial investment. The ECB has stress-tested 109 banks under a severe
cyberattack scenario and said most detected vulnerabilities have been fixed.
