Spotify confirmed on its Twitter feed that it has received a number of reports of malware being installed on users' computers after they were infected by an as yet unidentified advertisement.
"We've turned off all 3rd party display ads that could have caused it until we find the exact one," the company wrote.
Spotify said on Friday afternoon that it was still investigating what may have caused the security breach.
“We take this very seriously and will take every step possible to ensure it doesn't occur again,” it said.
In brighter news for the popular music service, Spotify has begun recruiting employees in the United States three months after it penned its first American distribution deal with recording industry giant Sony Music Entertainment.
On its website, the company said it was seeking a US regional controller, as well as a graphic designer, an interaction designer and a software engineer for New York-based jobs.
Spotify is working to get its services up and running in the United States as soon as possible.
European users can choose between a free streaming service that carries ads, an unlimited ad-free version that costs 49 kronor per month ($8), and a 99-kronor mobile-phone ready premium version that allows users to listen to music in offline mode.
As it continues to expand, the company is currently advertising a total of 29 positions on its site, with jobs also available in Stockholm, London, Manchester, Amsterdam, Oslo, and Barcelona.