The registration component in Cisco WebEx Training Center provides the training-session URL before e-mail confirmation is completed, which allows remote attackers to bypass intended access restrictions and join an audio conference by entering credential fields from this URL, aka Bug ID CSCul36183.
https://exchange.xforce.ibmcloud.com/vulnerabilities/89691
http://www.securitytracker.com/id/1029492
http://www.securityfocus.com/bid/64281
http://tools.cisco.com/security/center/viewAlert.x?alertId=32157
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6965