Exposed contact information can help criminals launch convincing scams, as security incidents involving exchanges and financial firms draw regulatory attention.

Coinbase denied suffering a security breach Wednesday after an incident at an analytics vendor exposed some customers' contact information.

In an Oct. 28 post on X, the exchange said the incident involved Amplitude, a third-party analytics provider, and affected a small subset of its customers. It found no evidence of unauthorized access to Coinbase systems and said customer funds remained secure.

The disclosure coincided with separate cyber incidents involving South Korean cryptocurrency exchange Bithumb, Daishin Securities and Mirae Asset Global Investments, prompting Binance founder Changpeng Zhao to warn about the growing risks of exposed financial information.

“4 data leaks reported today,” Zhao wrote on X, identifying the companies before outlining how criminals exploit compromised customer records for phishing, SIM swapping and social engineering.

“You can't prevent a leak, but you can protect yourself,” he added.

Coinbase said it was notifying affected customers and regulators but did not disclose how many individuals were involved or which contact details were compromised.

South Korean authorities launched investigations Wednesday after Bithumb, Daishin Securities and Mirae Asset reported unauthorized access to their systems.

Daishin confirmed that personal and financial information belonging to 38,490 customers had been exposed following suspicious activity detected on Oct. 17.

The compromised records included names, email and residential addresses, login IDs, bank names and encrypted account and telephone numbers. The brokerage said it had found no evidence of unauthorized access to its core operating systems or subsequent misuse of the information.

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