Exposure of Sensitive Information to an Unauthorized Actor
The web login functionality (c/portal/login) in Novell Teaming 1.0 through SP3 (1.0.3) generates different error messages depending on whether the username is valid or invalid, 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.