After experiencing iOS 8 wrong upgrade packages and location tracking problems, it's iCloud's turn to have problems.

MacRumors, an American technology blog, reported that due to a newly discovered vulnerability in iOS 8, when a user selects the "reset all settings" option in the iPhone, the documents in the iCloud Drive will be permanently deleted.

Previously, restoring factory settings would not affect photos, music and other media in the device. Media files and documents will be deleted only when the user selects "Delete all content and settings" and completely erases the phone content.

MacRumors reported that when resetting, the documents saved in iCloud Drive disappeared from the iWork application and could not be found through the OS X "Yosemite" desktop system.

However, at present, only iOS users, third-party developers based on Yosemite system, and testers participating in system testing have reported this problem. The iCloud Drive has entered the Windows platform, but it is not clear whether this problem also exists on the Windows platform.

In addition, it is unclear how widespread the problem is, or whether it affects all users who use iCloud Drive. Fortunately, the iCloud Drive files of third-party applications will not be affected by this vulnerability.

The Verge, an American technology blog, tested this and used "Reset All Settings" to delete all iWork documents saved in iCloud Drive on iPhone and iCloud.com. After synchronizing with the Mac upgraded to OS X "Yosemite", the document also disappears on the PC.

However, considering the small number of users of Apple's own iWork applications (Pages, Keynote, and Numbers), the impact will not be too great. For new OS X users, it is better to wait until the vulnerability is repaired before restoring the factory settings.