A security incident has forced the Department of Parliamentary Services (DPS) to ask all users to reset their passwords since the night of 7 February.
The incident hit the parliamentary computing network and resetting passwords to all of those with network access is one of the "number of measures" the DPS has implemented to protect the network and users.
"There is no evidence that any data has been accessed or taken at this time, however this will remain subject to ongoing investigation," a joint statement issued by House of Representatives speaker Tony Smith and Senate President Scott Ryan said.
The DPS and "relevant agencies" are taking steps to investigate the event also stating that there is no evidence that this is an attempt to influence the outcome of parliamentary processes or to "influence electoral or political processes".
Senator Jordon Steele-John said on Twitter that the "incident" meant he could not access his emails.
In its 2017-18 annual report, DPS announced plans to enhance the cyber security resilience of the Parliament ICT systems and networks through the formation of the Cyber Security Operations Centre.
Earlier this week, the Australian Signals Directorate revealed that it responded to more than a 1,000 cyber incidents during the last three financial years, which affected both classified and unclassified government networks, as reported by sister publication Computerworld.