Apple has released a silent update for Mac users removing a vulnerable component in Zoom, the popular video conferencing app, which allowed websites to automatically add a user to a video call without their permission.

The Cupertino, Calif.-based tech giant told TechCrunch that the update — now released — removes the hidden web server, which Zoom quietly installed on users’ Macs when they installed the app.

Apple said the update does not require any user interaction and is deployed automatically.

The video conferencing giant took flack from users following a public vulnerability disclosure on Monday by Jonathan Leitschuh, in which he described how “any website [could] forcibly join a user to a Zoom call, with their video camera activated, without the user’s permission.” The undocumented web server remained installed even if a user uninstalled Zoom. Leitschuh said this allowed Zoom to reinstall the app without requiring any user interaction.

He also released a proof-of-concept page demonstrating the vulnerability.

Although Zoom released a fixed app version on Tuesday, Apple said its actions will protect users both past and present from the undocumented web server vulnerability without affecting or hindering the functionality of the Zoom app itself.

The update will now prompt users if they want to open the app, whereas before it would open automatically.

Apple often pushes silent signature updates to Macs to thwart known malware — similar to an anti-malware service — but it’s rare for Apple to take action publicly against a known or popular app. The company said it pushed the update to protect users from the risks posed by the exposed web server.

Zoom spokesperson Priscilla McCarthy told TechCrunch: “We’re happy to have worked with Apple on testing this update. We expect the web server issue to be resolved today. We appreciate our users’ patience as we continue to work through addressing their concerns.”

More than four million users across 750,000 companies around the world use Zoom for video conferencing.