Australian media company Nova Entertainment has admitted information submitted by listeners has been leaked.

Personal information provided by callers to radio stations over a two-year period from 2009 to 2011 has been “publicly disclosed”, and the company is attempting to contact those affected.

The data disclosed may include names, gender, dates of birth, addresses, emails and phone numbers and user account details such as user names and passwords.

“We have notified the Office of the Australian Information Commissioner of this incident, and we are in the process of contacting law enforcement bodies,” CEO Cathy O'Connor said in a statement.

“We will fully and transparently engage with these entities in relation to this incident.

“We take privacy, and the security of the information we collect from our listeners very seriously, and on behalf of Nova Entertainment I deeply and sincerely regret that this incident has occurred.

“We are fully committed to achieving the best possible outcome for anyone affected by this incident.

“Upon confirming the validity of this incident, we immediately engaged leading privacy, IT and cyber security consultants to understand the circumstances of the disclosure.

“We are taking all necessary measures to ensure the strength and effectiveness of our cyber security, and there is currently no evidence of any suspicious activity or threats on Nova Entertainment's systems.”

Nova operates commercial radio networks Smooth FM, Nova 96.9 in Sydney, Nova 100 in Melbourne, Nova 106.9 in Brisbane, Nova 93.7 in Perth and Nova 919 in Adelaide, a pay TV station and mobile brands.

Nova Entertainment is wholly owned by Lachlan Murdoch’s private investment company.