Hackers have stolen the login details of 2.5 million PlayStation and Xbox users.

The email addresses and passwords of gamers who had been using the unofficial Xbox360 ISO and PSP ISO forums, which players use to share links to download free and pirated versions of games, were exposed by the cybercriminals behind the hack.

According to haveibeenpwned.com, which tracks cyber breaches, the details have since been shared publicly online.

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The breach actually took place in September 2015, but the details have only just been revealed.

“Data breaches are often sold via dark websites or within closed trading circles,” Troy Hunt, the owner of haveibeenpwned.com, told the Daily Mail.

“The prevalence of password reuse means that a relatively benign site can hold credentials that unlock far more valuable resources, for example, email or social media accounts.”

Nobody has yet claimed responsibility for the hack, but experts are urging gamers to review their security settings.

“Keep alert to any phishing scams that may appear in email as a result of this hack, changing passwords on any site where the passwords or usernames used on these sites are used,” said Robert Capps from NuData Security.

“This data is likely to be sold on the Dark Web and used for future cyber crime. It's a good reminder to choose unique passwords on all sites that require registration.”