ECB AI Cybersecurity Letter: The 31 October 2026 JST Action Plan
On 7 July 2026, the Chair of the ECB Supervisory Board, Claudia Buch, wrote to the CEO of every significant institution under a letter numbered SSM-2026-0301 and titled “Addressing AI-enabled cybersecurity threats”. The ECB AI cybersecurity letter does one operationally concrete thing behind its strategic language: it gives each directly supervised bank until 31 October…