The Servlet Engine/Web Container component in IBM WebSphere Application Server (WAS) 6.1 before 6.1.0.25 and 7.0 before 7.0.0.5, when SPNEGO Single Sign-on (SSO) and disableSecurityPreInvokeOnFilters are configured, allows remote attackers to bypass authentication via a request for a "secure URL," related to a certain invokefilterscompatibility property.