"[application] can't be opened because Apple cannot check it for malicious software" errors on Cask-installed apps

[chriskilding]

Output of brew config

N/A

Output of brew doctor

Your system is ready to brew.

Description of issue

When I install some macOS apps via brew cask, the installation succeeds but macOS prevents the app from opening with the following error:

[application] can't be opened because Apple cannot check it for malicious software.

This software needs to be updated. Contact the developer for more information.

Most recently I've seen this with the JetBrains Toolbox Cask (version 1.27.3.14493), but I have also seen it at random with other apps installed by Cask as well.

In the case of JetBrains Toolbox, I then tried directly downloading the very same version of the app from the JetBrains site and installing that. This worked without issue. This make me think there is something going on within Homebrew Cask that is breaking app notarisation... but only sometimes.

Because this only happens sometimes, I'm posting this as a question rather than a bug report. If you have seen this behaviour as well, I would welcome your comments.

Relevant casks

jetbrains-toolbox

[dkam]

I just discovered the same thing with rar and unrar, installed with homebrew. Reinstalling didn't help. MacOSX 13.4.

[fkurushin]

@dkam @chriskilding go to settings -> privacy and security than press allow do it for both rar and unrar and than run this commands in the terminal and press open

[andrewdai5]

worked for me.