Outlook bug downloads mysterious file in Safari


Microsoft’s Outlook email client has some macOS users worried this week. When accessing Outlook in Safari, the browser downloads a mysterious “TokenFactoryIframe” file, which some people believed to be malware or something potentially harmful to their computer. However, that doesn’t seem to be the case.

As reported by Latest version of Windowsmost complaints were seen on Reddit. According to several users, Safari downloads a file called “TokenFactoryIframe” every time they access Outlook through the web. The file has no extension and cannot be opened by any application.

Although 9to5Mac could not reproduce the problem, a significant number of users saw this unknown file on their Mac after accessing Outlook.

I use Outlook on the web when I want to check my work email from home. Starting today, every time I open Outlook on the web, my browser (Safari, on a MacBook Pro) downloads a blank text document called “TokenFactoryIframe”. He does it again and again without asking me anything. This does not happen on my work computer (Google Chrome, on a PC).

Luckily for users, the file is completely harmless as it has no content. A Microsoft spokesperson has confirmed that the company is now aware of a bug affecting Outlook users in which the web browser forcefully attempts to download an internal token. Specifically, the company has also confirmed that the bug only affects Safari users.

Microsoft recommends users access Outlook through another web browser until the bug is fixed. However, a possible workaround is to block all downloads from the Outlook website by going to Safari settings. Just follow the steps below:

  1. Click on the Safari menu then click Preferences.
  2. Go to the Websites tongue.
  3. Select the Downloads option in the sidebar.
  4. Look for Outlook and change their permission to To refuse.

Have you been affected by this Outlook bug? Let us know in the comments below.

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