Origin Energy confirmed a July data breach affecting 900,000 Australians. A company review identified 160 highest-risk exposures. Attackers accessed the full bank account details and ID numbers of 60 customers, drawing scrutiny about data security.

Origin limited internal access for employees while finalizing its review. The public announcement of the breach was followed by a 14% rise in Origin Energy shares, a move that surprised many observers.

The July data breach affected 900,000 Australians overall. Origin acted to restrict staff access as it finalized the company review. That review confirmed attackers gained access to full bank account details and ID numbers for 60 customers.

The 160 highest-risk exposures were identified through the internal review. It remains unclear how the attackers initially penetrated the company's defenses. Origin Energy has not yet detailed what corrective actions it plans to offer those who were affected.

The incident comes amid a string of major data breaches targeting organizations across Australia in recent years.