The server in IBM Tivoli Storage Manager (TSM) 5.1.x, 5.2.x before 22.214.171.124, and 6.x before 6.1 does not require credentials to observe the server console in some circumstances, which allows remote authenticated administrators to monitor server operations by establishing a console mode session, related to "session exposure."
CWE-287 - Improper Authentication
Improper (or broken) authentication attacks are widespread, and have accounted for many of the worst data breaches in recent years. Improper authentication attacks are a class of vulnerabilities where an attacker impersonates a legitimate user by exploiting weaknesses in either session management or credential management to gain access to the user’s account. This can result in disclosure of sensitive information, and can lead to system compromise, theft, identity theft, and fraud.