The j_spring_security_switch_user function in Cisco Unified Intelligence Center (CUIC) 8.5.4 through 9.1(1), as used in Unified Contact Center Express 10.0(1) through 11.0(1), allows remote attackers to create user accounts by visiting an unspecified web page, aka Bug IDs CSCuy75027 and CSCuy81653.
http://www.securitytracker.com/id/1036952
http://www.securityfocus.com/bid/93420
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-ucis2