The company is notifying about 8.2 million current and former customers about the breach.
“We know how these reports were accessed, and we have notified law enforcement.
We are also contacting customers whose data was impacted.
In addition, we continue to review and strengthen administrative and technical safeguards to protect information.”
Users outside the US were unaffected.
Block was previously known as Square, and Cash App was previously known as Square Cash.
News of the breach wasreportedearlier by TechCrunch.