The WS-SP UsernameToken policy in Apache CXF 2.4.5 and 2.5.1 allows remote attackers to bypass authentication by sending an empty UsernameToken as part of a SOAP request.
Apache CXF versions 2.4.5 and 2.5.1 fail to validate a WS-Security UsernameToken received as part of the security header of a SOAP request against a WS-SP UsernameToken policy.