Optus, the Australian subsidiary of Singapore Telecommunications, announced earlier today that it was investigating a cyber-attack allowing access to customer data.

The company confirmed that the attack was instantly stopped, preventing the compromise of customer payment information and account passwords. However, Optus confirmed that the attacker may have obtained some home addresses, driver's license numbers, and passport numbers.

Optus, which has 9.7 million subscribers according to publicly available data, also notified financial institutions about the attack and subsequent breach.

Optus customers are now more vulnerable to phishing, with their credentials potentially already on the dark web, according to the executive.

Optus, the Australian subsidiary of Singapore Telecommunications, was hit by a cyber-attack. Customer payment information and account passwords were not compromised, but personal details may have been accessed. Optus customers are now more vulnerable to phishing, with their credentials potentially already on the dark web.