Origin Energy disclosed a July data breach affecting 900,000 Australians. A corporate investigation identified 160 top-risk exposure incidents. Attackers accessed the full bank account details and ID numbers of 60 customers, raising serious concerns about data security.

Origin restricted staff access while finalizing its review. The breach disclosure was followed by a 14% rise in Origin Energy shares, a move that caught market watchers off guard.

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

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

The incident comes amid a string of major data breaches hitting Australian companies in recent years.