GDPR Q5

What should I do if I accidentally share personal data?

Q5. What should I do if I accidentally share personal data?

Category: Breach Response

If you accidentally share personal data, act straight away. Quick action limits harm and shows the ICO that you take your responsibilities seriously.

In simple terms

Contain the incident first, then investigate.
Work out the risk to people and decide if you must notify the ICO.
Record everything so you can prove what happened and how you fixed it.

Immediate containment

Stop the data from spreading further. That might mean recalling an email, disabling an account, or asking the unintended recipient to delete the information.

Change passwords or revoke access tokens if systems were exposed.
Recover physical documents or devices if they can be retrieved safely.
Keep evidence of the steps you took to contain the breach.

Assess the damage

Work out what data was involved, how many people were affected, and what could happen to them. This assessment determines whether you must notify the ICO or the individuals.

Look for special category or financial data, which raises the risk.
Consider whether the data is already in the public domain.
Decide if people need advice, such as changing passwords or watching for scams.

Notification duties

If the breach is likely to result in a risk to rights and freedoms, notify the ICO within 72 hours. If there is a high risk, tell the affected individuals promptly and explain how you are helping them.

Provide the ICO with details of the breach, contact information, and mitigation steps.
Share practical guidance with affected people, such as contact details for credit agencies.
Document the reasoning if you decide that notification is not required.

Practical steps to take

Activate your incident response team and assign clear roles.
Gather facts about the breach without delaying containment.
Complete a risk assessment and log it in your breach register.
Notify the ICO and individuals if required, keeping copies of communications.
Review policies, training, and controls to prevent repeat incidents.

Real-life examples

Wrong attachment

A housing association emails a tenant the wrong rent statement. The team recalls the message, contacts the recipient, and reports the breach to the ICO because it reveals financial history.

Printed list left in public

A volunteer leaves a sign-up sheet with names and phone numbers in a café. The organisation recovers the sheet quickly, records the breach, and decides ICO notification is not required because the risk is low.

Helpful reminders

Every breach, no matter how small, must be logged internally.
Use incidents as learning moments to strengthen your controls.
Provide support to affected individuals and answer their questions honestly.
Keep board members or senior leaders informed about significant breaches.

Key takeaway

Contain, assess, notify, and learn—following these steps shows accountability and protects the people whose data you hold.