Months on from a devastating triple-zero network failure that has been linked to multiple deaths, the telco has paid a six-figure fine for breaching anti-scam rules.
The Australian Communications and Media Authority found Optus' Coles Mobile brand breached the rules on 44 occasions in 2024, after scammers picked their way through their "vulnerable" third-party identity verification system.
At least four consumers' mobile services were taken over by scammers after they were able to skip parts of the verification process.
It meant they could access the customers' bank accounts, with ACMA finding reported losses of $39,000.
The $826,320 Optus paid in a fine was the maximum penalty they could be hit with under the code, ACMA's Samantha Yorke said.
"While this was a one-off issue which was quickly remediated, it is inexcusable for any telco not to have robust customer ID verification systems in place, let alone Australia's second largest provider," she said.
"Scammers are always looking for any weaknesses in systems, and on this occasion Optus left a vulnerability which directly exposed people to harm."
Optus both apologised and accepted the fine, blaming a technical issue within its porting system which it said was managed by its service provider.
The technical issue was solved within 24 hours and the service provider has since strengthened its resilience, it claimed.
"Optus continues to work closely with government, the banking sector, and industry partners to make it increasingly difficult for criminals to misuse telecommunications services for identity theft," an Optus spokesperson said.
It is a fresh blow for the telco's badly-damaged image after a major outage which saw more than 600 triple-zero calls not able to be connected.
But Optus has defended a near-18-hour delay in providing government authorities with key details, including that deaths had been linked to the outage.
A fresh problem was reported in early November, with a fibre break in the Hunter Valley region of NSW impacting customers' ability to contact emergency services.
Optus has commissioned an independent review into the outages, led by Kerry Schott, which is due before year's end.
It also pledged to hire 300 new Australia-based contact centre workers and brought forward plans to "on-shore" network operations in Australia.
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