Reports of stolen passwords from insecure certificates.
Apple has issued a new security warning for users of its iCloud in the midst of alleged reports that user passwords and other information being stolen from its online storage service in China.
Apple said in a statement: "We’re aware of intermittent organised network attacks using insecure certificates to obtain user information, and we take this very seriously.
"These attacks don’t compromise iCloud servers, and they don’t impact iCloud sign in on iOS devices or Macs running OS X Yosemite using the Safari browser."
The iPhone maker suggested users to pay attention to the invalid certificate warning when visiting the iCloud site and not to move ahead.
Apple added: "Users should never enter their Apple ID or password into a website that presents a certificate warning."
The latest effort follows reports that iCloud users in China had been targeted by a new "man-in-the-middle" (MITM) attack, which was aimed at stealing user credentials and keep an eye on their activities.
The latest vulnerability reports come soon after the launch of iPhone 6 in China, following a month-long regulatory delay tied, partly, to worries related to security of the new device.