Leitschuh first disclosed the vulnerability to Zoom back in March. This re-install ‘feature’ continues to work to this day.

One of the most jarring aspects of this vulnerability is that it works even if you have uninstalled the Zoom app:Īdditionally, if you’ve ever installed the Zoom client and then uninstalled it, you still have a localhost web server on your machine that will happily re-install the Zoom client for you, without requiring any user interaction on your behalf besides visiting a webpage. We tested the vulnerability using a link in Leitschuh’s Medium post and were immediately connected to a Zoom conference call with our Mac’s camera enabled. Thus, any website is able to “forcibly join a user to a Zoom call, with their video camera activated, without the user’s permission.” If you simply click a link, you’ll automatically join a Zoom conference call with your camera enabled, even if you no longer have the Zoom app installed. It’s that web server that is seemingly causing this vulnerability.Įssentially, the Zoom web server is running as a background process. When you install the Zoom app on your Mac, it also installs a web server, which “accepts requests regular browsers wouldn’t,” as detailed by The Verge.

In a post on Medium, security researcher Jonathan Leitschuh outlined the flaw, which could let websites take over your Mac’s camera. Update: Zoom says it has a series of updates planned to address these security concerns.Ī new zero-day vulnerability has been disclosed for the Zoom video conference app on the Mac.

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