Coinbase Denies Internal Breach as Amplitude Security Incident Hits User Contact Info

A Coinbase data breach claim surfaced on October 28, 2026, after SlowMist CISO 23pds (@im23pds) posted that hackers had accessed contact information for more than 70,000 users. Coinbase pushed back quickly. The exchange confirmed that it had “not had a data breach”, pointing instead to a security incident at its analytics vendor, Amplitude, which affected