Millions of accounts associated with video-sharing site Dailymotion, one of the biggest video platforms in the world, have been stolen, according to online reports.

Hackers whose identities are unknown managed to gain access to more than 85 million records, including e-mail addresses and usernames.

As well as the identifying information, cyber attackers managed to take around 18.3 million passwords associated with the accounts, reported Britain's Telegraph. The passwords were hashed, meaning that they were scrambled and not immediately easy to read.

Dailymotion has acknowledged the security breach on its global users and is advising users to reset their security details, said the Daily Mail.

The hack is thought to have been carried out on Oct 20, according to LeakedSource - a dark web monitor that discovered the hack against Friend Finder Networks in November 2016 and which obtained the data on Dailymotion.

Although the information taken does not include every users' password, and those that were included are not easily readable, users are still at risk of phishing attacks and possible identity theft, the Telegraph said.

Commenting on the attack, chief executive of cyber security company Intercede, Richard Parris, told the Mail: "Unfortunately for the consumers affected by the Dailymotion hack, it's not just their Dailymotion accounts which are at risk. Without a doubt, there will be a number of customers who recycled their passwords across numerous sites."

Paris-based Dailymotion, which launched in 2005, is the 113th most popular website in the world, according to Alexa rankings. It's owned by Vivendi, a French media conglomerate that also invests in Ubisoft and Gameloft.

Leaked Source says it has a further 20 to 30 hacks to reveal before the end of the year, said the Telegraph.