CRLF injection vulnerability in IBM WebSphere Portal 6.1.0.x before 6.1.0.3 CF26, 6.1.5.x before 6.1.5 CF26, 7.0.0.x before 7.0.0.2 CF21, and 8.0.0.x through 8.0.0.1 CF5, when home substitution (aka uri.home.substitution) is enabled, allows remote authenticated users to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via unspecified vectors.