List of data breaches and cyber attacks in August 2021 – 61 million records breached

It has been another month of comparatively few reported cyber attacks and data breaches, with our August list containing 84 incidents accounting for 60,865,828 breached records.

And it would have been even fewer if not for the attack on T-Mobile. The mobile network disclosed a hack earlier this month, which it originally said affected 7.8 million customers and 40 million records. However, a week later it bumped up that figure to 53 million.

You can that incident, along with our full list of cyber attacks and data breaches, below – with those affecting UK organisations listed in bold.

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Cyber attacks


Data breaches

Financial information

Malicious insiders and miscellaneous incidents