Exposure of Sensitive Information to an Unauthorized Actor
IBM Tivoli Provisioning Manager Express provides unspecified information in error messages when (1) attempted duplication of a username occurs when creating an account or (2) when trying to login using a valid username, which makes it easier for remote attackers to enumerate usernames.
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.