What Happens in a Data Breach?

Containing the situation

The first priority after a breach is usually to contain it, limiting any further loss, access or disclosure. This might mean stopping an ongoing issue, securing information that has been exposed, or otherwise taking control of the situation.

Containment is about acting quickly and sensibly so that the impact does not grow while the rest of the response is worked out. Stemming the problem early often makes everything that follows more manageable.

It is the practical first move. Before assessing or notifying, it makes sense to make sure the situation is not still getting worse, so that the response is built on a stable footing. Settling the situation first gives the later steps a stable and reliable foundation to build on.

Assessing the impact

Once contained, the focus typically shifts to understanding what happened: what information was involved, who might be affected, and what the consequences could realistically be. This assessment shapes everything that follows.

A careful assessment matters because not all breaches are equal. The right response should fit the seriousness of the situation, and that can only be judged sensibly once the facts are reasonably clear.

Taking the time to understand the situation properly is not delay for its own sake. It ensures that any further steps, including whether to notify, are based on what actually occurred rather than assumptions. A clear-eyed look at the facts ensures the response is proportionate to what actually happened.

Notifying where required

In some circumstances, there is a recognised scheme that requires notifying affected individuals and the regulator. Whether notification is required depends on the nature of the breach and the law, so it is a matter of judgement against the rules.

Where people are notified, the aim is to give them useful information so they can take any steps that might help protect themselves. We deliberately avoid stating fixed timeframes, as these depend on the rules and circumstances.

We cover the notification scheme in a separate entry. This is general information only and not legal advice, and the OAIC's guidance is the authoritative source for how notification works. The focus throughout is on helping affected people, which is the whole reason notification exists.

Learning from it

A good response does not end when the immediate issue is resolved. Reviewing what happened and adjusting practices helps reduce the chance of a repeat, turning a difficult event into an opportunity to improve.

This learning step is part of handling information responsibly. Understanding how a breach occurred, and addressing any weaknesses, strengthens protection going forward for everyone whose information is held.

The national privacy regulator, the OAIC, publishes guidance on handling breaches. If you have a concern about a matter involving us, you can contact us, and our privacy page explains our approach. Treating each incident as a chance to improve strengthens protection for everyone over time. It is a sensible step to take.