Firefighters still didn't know if their information was compromised despite requesting an update from Fire Rescue Victoria more than a year ago, their union says.
The service's chief information officer is set to give a presentation on the attack at a conference on Thursday, with United Firefighters Union secretary Peter Marshall saying that puts paid attendees before firies.
"Firefighters and FRV employees have been waiting for more than a year and a half for basic answers on this attack," Mr Marshall said.
"They have a right to know what happened, who is responsible, whose information was exposed, where it has gone, exactly how systems were affected, when they will be fixed, and how this was allowed to happen in the first place."
The 2022 cyber attack left the FIRECOM firefighting information system offline for a year, and the rostering system still hasn't been restored.
In July this year, firefighters requested an update on the attack via Zoom meeting, which was agreed to by officials but didn't happen, the union said.
"It is unacceptable that there has been no action on this request," Mr Marshall said.
Fire Rescue's chief information officer Chris Moon will lead a presentation at an industry event on Thursday afternoon titled, "Responding to a cyber attack in emergency services: the first 48 hours".
Mr Marshall slammed the decision and said it put conference attendees before staff.
"It is beyond unacceptable the C-level executive in charge of information security has chosen to deliver the inside story of this cyberattack to a paying audience rather than sharing information with the people who were affected by it."
Fire Rescue Victoria has been contacted for comment.