Coinbase Data Breach: Exchange Says Its Systems Were Not Compromised After Amplitude Vendor Leak

More than 70,000 Coinbase customers may have had their contact information exposed on October 28, 2026 — but not through a breach of the exchange itself. Coinbase’s support account said a security incident at Amplitude, a third-party analytics vendor, exposed a “small subset” of Coinbase customer contact data, and that Coinbase’s own systems were never compromised. The clarification landed roughly half an hour after a security researcher described the event as a confirmed Coinbase data breach.