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Telstra has become the latest telco to be managing a breach of its staff data, as millions of Australians rush to protect sensitive details stolen in the Optus cyber attack.

A Telstra spokesman confirmed up to 30,000 former and current workers have had their names and email addresses uploaded to a forum on the dark web.

He said Telstra itself was not hacked, but a third party which was offering a rewards program for staff had the data breach in 2017.

The breach does not involve any customers.

"No customer account information was included, we believe it's been made available now in an attempt to profit from the Optus breach," the spokesman said on Tuesday.

"The relevant authorities have been notified, we've let current employees know, and while the data is of minimal risk to former employees, we will attempt to notify them too."

Meanwhile, Optus has finally handed over data to Services Australia almost a fortnight after a massive data breach was revealed.

Labor frontbencher Bill Shorten confirmed the government agency had received the data on Tuesday and was assessing it to see what could be drawn from it.

"We shouldn't have to play hide and seek and wait to day 13 to get material," he told reporters in Canberra.

"What it's about is the horse has bolted. We're trying to close the gate.

"All I'm motivated by is ... to get the information so I can stop hackers from hacking into government data and further compromising people's privacy."

Mr Shorten said Optus had revised its estimates to 50,000 compromised Medicare records and 150,000 passports.

He called for the telco to be more forthcoming with information.

It comes as a majority of Australians would back a move to strengthen privacy protections in the wake of the massive data breach.

Guardian Essential poll results published on Tuesday found just over half of respondents supported tighter restrictions on the amount of information companies could collect on consumers.

An overwhelming majority of the 1050 respondents also said they were worried about scammers stealing their identity to set up bank accounts, despite only 21 per cent saying they were directly affected by the Optus breach.

The survey comes after Optus's parent company advised it had engaged lawyers in case it was subject to any class action over the hack, which involved the personal details of more than 10 million customers being compromised.

In a statement to the Singapore stock exchange on Monday, Optus owner Singtel said it had not received any legal notice of a class action but any such move would be "vigorously defended".

The company also said it wanted to clarify media reports about potential fines or other costs relating to the incident.

"Singtel considers these reports speculative at this juncture and advises that they should not be relied upon," it said.

Optus on Monday said more than two million customers had their identification documents exposed in the data breach.

The telecommunications giant has launched an independent review conducted by consultancy firm Deloitte of the circumstances surrounding the data hack.

Optus chief executive Kelly Bayer Rosmarin recommended the review, saying the company was committed to rebuilding trust with customers.

Several government ministers have criticised the company's response to the incident and its failure to promptly advise customers or the government what personal details had been compromised.

Attorney-General Mark Dreyfus has said he will review Australia's privacy laws and tighter protections could be brought in by the end of the year.

© AAP 2022

The Albanese government has kicked off the multinational tax reforms it promised during the federal election.

Labor pledged to support the OECD's "two pillar" approach to crack down on multinational tax avoidance, which includes a 15 per cent floor rate for corporate tax globally to help eliminate tax havens.

The OECD reforms also involve a new mechanism allowing multinationals to be taxed in part based on where they sell products and services rather than where they situate their headquarters and intellectual property.

The Labor government has now opened consultation on its tax reform agenda.

"This is all about consulting widely on the proposed OECD multinational tax changes and what they'd mean for Australia," Treasurer Jim Chalmers said.

Dr Chalmers said the reforms would ensure multinationals paid their fair share of tax and would help fund critical services.

OECD Secretary-General Mathias Cormann, a former West Australian senator, said he was "quietly optimistic" about the global corporate tax reforms.

Speaking at the OECD's Forum on Tax Administration Plenary in Sydney on Friday, Mr Cormann said the global minimum would become "self-perpetuating" once most countries were signed up.

"As it will not be in any country's interest to leave money on the table for other jurisdictions to collect at their expense," he said.

© AAP 2022

The teenage labourer charged over a horror crash that killed five high school students has been granted bail by the NSW Supreme Court.

Tyrell Edwards, 18, will be able to leave home for few reasons and then only in the company of his mother, as he awaits the outcome of his case.

He has been in custody since September 6 when his ute crashed into two trees near the Wollondilly Shire village of Buxton, killing five Picton High School pupils aged 14 to 16.

While the crash had caused obvious grief and suffering, and the prosecution case appeared reasonably strong, Supreme Court Justice Robert Beech-Jones said that wasn't enough to simply refuse bail.

Keeping Edwards in custody until trial - potentially two years away - was a long time for an 18-year-old "with no criminal history charged with a non-intentional crime".

"Despite great suffering and grief experienced, this was not a finely balanced bail application," the judge said on Tuesday.

"On the contrary, on any proper understanding, the application had to be granted."

Edwards' parents have promised to forfeit $100,000 if their son fails to appear in court.

The teenager was refused bail in September after a magistrate concluded Edwards posed a risk to the community and could tamper with witnesses due to his strong ties to the community.

But Justice Beech-Jones said it appeared the case would turn on forensic evidence and any risks could be mitigated by bail conditions.

Those conditions include not contacting any prosecution witnesses, reporting daily to police and not being in the driver's seat of any vehicle.

Edwards also cannot be in the company of any person under the age of 18 unless with his mother, who must also accompany him on his release from a remand centre on Tuesday.

He's next due in Picton Local Court in November.

In the moments before the crash, police allege Edwards drove at high speed, lost control, crossed onto the wrong side of the road and travelled along a grassy road shoulder for about 40 metres.

A video allegedly taken in the lead-up to the fatal crash supported elements of the offences and showed a high level of moral culpability.

The video, filmed by Edwards on his phone about an hour before the crash, shows him driving with two of the victims, according to a summary of police facts.

However, the relevance of that was disputed by Edwards' lawyers in the Supreme Court.

© AAP 2022