Zoom intentionally created a vulnerability to work around a security improvement in Safari. This was done to save the user a single click.
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Good question. The installer for Zoom explicitly sets the WarnOnOpen registry value to 0 for the zoommtg protocol. Edge and IE both obey this registry directive, and happily launch the associated app w/o warn.
![](https://pbs.twimg.com/media/D_DMnu8WsAA866l.png)