List of data breaches and cyber attacks in April 2021 – 1 billion records breached

It was another busy month in the cyber security sector, as we discovered 143 incidents that resulted in 1,098,897,134 breached records.

Ransomware was again one of the biggest contributors to that total, accounting for almost one in three data breaches.

As always, you can find the full list of incidents below, with those affecting UK organisations listed in bold.

In case you missed it, you may also be interested in our first quarterly review of data breaches and cyber attacks. The report takes the information collected in these lists and summarises our findings.

It includes year-on-year comparisons in the number of incidents that were detected, a review of the most frequently breached sectors and a running total of incidents for the year.

Cyber attacks


Human error is to blame for 88% of data breaches in the UK

Data breaches

Financial information

Malicious insiders and miscellaneous incidents

In other news…

Will you be next?

No one thinks their organisation will fall victim to a security incident until it happens to them – but as we’ve demonstrated here, data breaches are so prevalent that everyone must have a plan.

If you find yourself staring down disaster, IT Governance is here to help. Our Cyber Incident Response service provides the help you need to deal with the threat, as our experts guide you through the recovery process.

They’ll review the breach, mitigate the damage and ensure that you are up and running again as soon as possible.


  1. Larsson 5th May 2021
    • Luke Irwin 5th May 2021

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