Coinbase says a security incident at analytics vendor Amplitude affected a subset of customer contact data. It reports no evidence of unauthorized access to Coinbase systems or impact on customer funds and is notifying affected users and regulators. Specific data fields, customer counts and the incident’s duration have not been disclosed. This is separate from its 2025 customer-support-related breach. The absence of an internal-system compromise does not eliminate the possibility of impersonation or phishing using exposed contact information.