By Sam Frizell
Updated: February 19, 2015 11:43 AM ET

Computer manufacturer Lenovo is getting flak for selling laptops with marketing software that experts say opens up a door for hackers.

The software, called Superfish, analyzes users’ Internet habits and displays third-party ads based on that activity, The Next Web reports.

Troublingly, Superfish also impersonates certificates for encrypted websites in order to monitor users’ behavior even on protected sites. That can open a door for hackers targeting sensitive information like passwords or banking details, because users’ data isn’t being protected as well as it ought to be.

In a statement Thursday, Lenovo said it stopped preloading the software in January, and won’t preload it in the future. Lenovo also defended itself from criticism over installing Superfish in the first place, arguing the software doesn’t pose a security risk despite what several experts have said.

“We have thoroughly investigated this technology and do not find any evidence to substantiate security concerns,” Lenovo said. “But we know that users reacted to this issue with concern, and so we have taken direct action to stop shipping any products with this software.”

Contact us at editors@time.com.

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