IBM WebSphere Message Broker 6.1 before 126.96.36.199, 7.0 before 188.8.131.52, and 8.0 before 184.108.40.206 does not validate Basic Authentication credentials before proceeding to WS-Addressing and WS-Security operations, which allows remote attackers to trigger transmission of unauthenticated messages via unspecified vectors.
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.