List of data breaches and cyber attacks in October 2020 – 18.4 million records breached

With 117 publicly reported security incidents, October 2020 is the leakiest month we’ve ever recorded.

The good news is that those data breaches and cyber attacks accounted for just 18,407,479 breached records.

However, it’s worth noting that, in very few incidents, the number of affected records is revealed – either because the organisation doesn’t know or because it’s not required to disclose that information.

With that in mind, here is our complete list of October’s cyber attacks and data breaches. As usual, incidents affecting UK organisations are in bold.

Cyber attacks

ransomware stat


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

Data breaches

Financial information

32% of data breaches involved phishing.

Malicious insiders and miscellaneous incidents

In other news…