The Commonwealth Bank of Australia has blamed a "critical security change" on its systems for ATM and EFTPOS outages that left some customers unable to access their funds yesterday.
The bank yesterday apologised for problems with its systems that left some customers unable to withdraw cash from Commonwealth Bank ATMs or use EFTPOS at retailers equipped with CBA EFTPOS systems.
"The Commonwealth Bank made a critical security change to its systems this morning," the bank said in a statement to ZDNet Australia yesterday. "As a consequence, merchants using CBA terminals have intermittently had valid MasterCard, Visa or other scheme debit card transactions declined at the point of sale."
"There has also been some intermittent issues with our ATM network, which has resulted in some machines place limits on cash withdrawals."
The bank said that the ATM and POS network had been fully restored by 5pm yesterday afternoon.
The outage followed with a security upgrade for the bank's online banking service NetBank over the weekend, which included an extension of its NetCode SMS and token identity verification service to shopping sites that use the MasterCard SecureCode or Verified By Visa payment methods. The upgrade saw NetBank go offline between Friday night and Saturday morning.