A faulty server-side update released to Outlook causes “TokenFactoryIframe” to automatically download itself when Safari users visit the web version of Microsoft Outlook.

The file, which has a size of 0 KB is automatically downloaded to the Mac‘s hard drive. The file does not have a file extension and cannot be opened.The download occurs when visiting Outlook via Safari on macOS. Sometimes, the file may attempt to redownload itself every few seconds. The problem does not appear to exist on Windows-based machines.

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