Cyber attackers have accessed eBay customers' names and contact details, the company said in a statement.
eBay said: "The database, which was compromised between late February and early March, included eBay customers’ name, encrypted password, email address, physical address, phone number and date of birth.
"However, the database did not contain financial information or other confidential personal information."
The online auction site said evidence of the hack was first detected about two weeks ago, but it was now making the announcement after "extensive forensics".
eBay has urged its users to change their passwords after the website was hit with a huge data breach.
In a statement, the online auction site said a cyberattack had "compromised a database containing encrypted passwords and other non-financial data".
Cyberattackers hacked employee log-in credentials, allowing them access to the company's corporate network.
Tests so far show no evidence of unauthorised activity by users or access to financial or credit card information, eBay said.
The US Government have warned that hackers are attempting to exploit the 'Heartbleed' bug by scanning networks to see if they are vulnerable, saying they could now "exploit unpatched systems".
Larry Zelvin, a Department of Homeland Security official who runs an agency centre that monitors and responds to emerging cyber threats said on his White House blog:
"While there have not been any reported attacks or malicious incidents involving this particular vulnerability at this time, it is still possible that malicious actors in cyberspace could exploit unpatched systems."
Former editor Andy Coulson "set up the payments to facilitate" phone hacking at the News of the World, it was claimed in court today by former royal editor Clive Goodman, who made the accusation against his old boss.
Goodman later described that he felt he was being "hung out to dry" after his arrest.
In a meeting with Coulson at a cafe in Wimbledon, south west London, he said his boss allegedly tried again to convince him to admit he was a "lone wolf" and had "gone off the reservation".
The names of around 100 firms and individuals who allegedly used corrupt private investigators was handed from Serious Organised Crime Agency (Soca). Soca has come in for criticism over the way it has dealt with the case sparking a row over transparency.
In a letter to the Home Affairs select committee information Commissioner Christopher Graham wrote: "The documentary evidence we hold in relation to these clients is considered significant, and this gives us the best opportunity of instigating criminal proceedings."
The "blue-chip hacking" list was drawn up at the request of the committee and relates to Soca's Operation Millipede, which led to the conviction of the private detectives jailed for fraud in 2012.
Britain's data watchdog is poised to call in the FBI to investigate the so-called blue chip hacking scandal, it has been reported.
Information Commissioner Christopher Graham has told MPs he will contact United States authorities after finding a number of companies contracted private investigators in the UK to hack, blag and steal sensitive data, according to the Independent.
Mr Graham has also revealed that "Demand for Access" notices are being prepared so investigators can get at further evidence from the 11 clients in Britain.
They hired four private detectives jailed two years ago after accessing bank account and mortgage details, medical records and information from the Police National Computer, it added.
A hacking group who claimed to have compromised the Dropbox website is reported to have disrupted the file-sharing site with a 'denial-of-service' cyber attack.
@youranonpriest don't ruin the suspense brother! lol it was a pretty massive DDoS too! We used all of our bots on it!
The hacker group 1775 Sec have said that they have compromised the Dropbox website. According to Dropbox, the website outage occurred during "routine internal maintenance".
Former Sunday Mirror editor Tina Weaver, who worked at the paper between 2001 and 2012, was arrested in a dawn raid as part of the Metropolitan Police's Operation Weeting inquiry into phone hacking in March.
Today the publisher of the Sunday Mirror, MGN Limited, has said it is being investigated for alleged phone hacking by ex-employees. Police are looking at whether it is criminally liable for alleged unlawful conduct
Ms Weaver, who was heavily pregnant at the time of her arrest, was held with former deputy editor of the newspaper Mark Thomas, current People editor James Scott and deputy editor Nick Buckley. All four were released on bail.
Trinity's Mirror's announcement comes after former Sunday Mirror and News of the World journalist Dan Evans was last week charged with phone-hacking offences.
He is accused of two counts of conspiring with others to intercept communications in their transmission, one of conspiracy to commit misconduct in public office and one of perverting the course of justice.
Trinity Mirror has released a statement following the announcement its subsidiary - MGN Limited - which publishes its national newspapers, is under investigation in relation to alleged phone hacking by its former employees. The investigation is said to be in its "early stages".
The group does not accept wrongdoing within its business and takes these allegations seriously.
It is too soon to know how these matters will progress and further updates will be made if there are any significant developments.