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Microsoft Leaks Unique User Account Identifiers in Clear Text

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#1 NickAu


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Posted 07 October 2015 - 03:37 PM


Researcher finds that Outlook and OneDrive leak unique user account identifiers in clear text

Microsoft’s OneDrive and Outlook.com are leaking unique user identifiers in plain text. A developer who goes by the name of  ramen-hero has said that both Outlook.com, OneDrive, and Microsoft’s account pages incorporate a unique user identifier known as CID in URLs.  The CID is a 64-bit integer (usually formatted in unsigned hexadecimal form)  associated with each Microsoft account and used in Microsoft APIs for user identification.

Ramen-hero has made a post on aptly named, Annoyed Microsoft User, detailing how Microsoft is leaking this CIDs in plain text to anyone who wants them.

What’s the problem with this?  Well, it turns out that the CID can reveal quite a bit about the account owner.  For example, if your account’s CID is 039827D56AE85E00 and Alice knows it, she could


Microsoft Leaks Unique User Account Identifiers in Clear Text


Good one MS, Way to keep our details secure.

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#2 TsVk!


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Posted 07 October 2015 - 04:23 PM

Seems a bit reactionist IMHO. Not much to see or do with that.


If one could impersonate you and access your secure data with the CID this would be major, or if the whole operating system gathered all of your personal, network and system information and sent it back to Microsoft whether you liked it or not... that'd be major too.

#3 Animal


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Posted 07 October 2015 - 04:36 PM

Subject was already posted and has been moved. http://www.bleepingcomputer.com/forums/t/592648/microsoft-sites-expose-visitors-profile-info-in-plain-text/

Please continue discussion in the original topic.

This one is now closed.

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