Paddy Power and Betfair users warned of 'email danger' after breach
The company provided affected users with online safety information and told them: "There is nothing you need to do in response to this incident, however we recommend you remain vigilant."
Some personal information including IP addresses, email addresses, and online activity data has been compromised.
A spokesperson for Flutter Entertainment, which owns the online gambling brands, confirmed to the BBC it had "suffered a data incident."
Some Paddy Power and Betfair customers have been warned to "remain vigilant" after a hack of up to 800,000 users.
Flutter Entertainment has 4.2 million average monthly players across all its brands in the UK and Ireland.
Its other betting companies include Sky Bet and Tombola.
The company said the incident has now been contained and added: "No passwords, ID documents or usable card or payment details were impacted."
However, cybersecurity experts have warned the breached data could be used to target unsuspecting customers with convincing personal emails in what's known as a spear phishing attack.
Harley Morlet, chief marketing officer at Storm Guidance, said individuals that spend large amounts of money with these gambling companies could be targets.
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