Chilean banking regulator SBIF announced via Twitter a new card data leak in the country's banking sector on Sept. 6, with at least 426 cards affected.
Banco Falabella said it immediately responded to the incident by blocking 48 compromised cards, adding that it was contacting affected clients personally, Diario Financiero reported.
A data breach in late August resulted in information for around 825 credit cards leaking on Twitter. Earlier in the year, a virus attack at Banco de Chile led to the theft of about $10 million.
Amid those attacks and other data breaches in Chile's banking sector this year, local authorities have been urging bank executives to strengthen their cybersecurity protocols.
Experts say the surge in cyberattacks against Latin American banks underscores how ill-prepared many financial institutions are to combat a sophisticated global hacking network. Chile recently signed an agreement with the U.S. to boost collaboration in fighting cybersecurity threats.