A listing for an iPhone 5S contained code that resulted in users being sent to a scam site
EBay has been compromised so that people who clicked on some of its links were automatically diverted to a site designed to steal their credentials.
The spoof site had been set up to look like the online marketplace's welcome page.
The US firm was alerted to the hack on Wednesday night but removed the listings only after a follow-up call from the Reporters more than 12 hours later.
One security expert said he was surprised by the length of time taken.
"EBay is a large company and it should have a 24/7 response team to deal with this - and this case is unambiguously bad," said Dr Steven Murdoch from University College London's Information Security Research Group.
The security researcher was able to analyse the listing involved before eBay removed it.
He said that the technique used was known as a cross-site scripting (XSS) attack.