In a statement, the legislature's presiding officers said "a number of measures" had been taken to protect the network following a "security incident on the parliamentary computing network."
"There is no evidence that any data has been accessed or taken at this time, however this will remain subject to ongoing investigation," the statement said.
The officers said they had no evidence as yet that the hack was an attempt to influence or disrupt parliament.
Australia's opposition Labor Party leader Bill Shorten said Friday the attack on parliament should be a "wake up call."
"What happened today is Parliament is all part of a bigger picture," Shorten told reporters.
"The internet's fantastic, but there are people out there in the cyber world who want to do Australians, and Australian business, and Australian security, harm."
"Accurate attribution of a cyber incident takes time and investigations are being undertaken in conjunction with the relevant security agencies," it said.
Gloss