Exposure of Sensitive Information to an Unauthorized Actor
The OutlookAction Class in Cisco WebEx Meetings Server allows remote attackers to enumerate user accounts by entering crafted URLs and examining the returned messages, aka Bug ID CSCuj81722.
CWE-200 - Information Exposure
An information exposure vulnerability is categorized as an information flow (IF) weakness, which can potentially allow unauthorized access to otherwise classified information in the application, such as confidential personal information (demographics, financials, health records, etc.), business secrets, and the application's internal environment.