Exposure of Sensitive Information to an Unauthorized Actor
Directory Services in Apple Mac OS X 10.5 through 10.5.4, when Active Directory is used, allows attackers to enumerate user names via wildcard characters in the Login Window.
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.