Coinbase denied a data breach and said none of its internal systems were accessed without authorization. According to the exchange, an incident at Amplitude on October 27 and 28, 2026, exposed the email addresses and phone numbers of a small subset of customers. Security firm SlowMist estimated that contact data belonging to more than 70,000 Coinbase users may have been accessed by hackers. Coinbase said passwords, transaction histories and customer funds were not compromised, and added that it has notified affected customers and the relevant regulatory authorities.
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