The The Cisco Product Security Incident Response Team (PSIRT) has published one important vulnerability advisory:  Multiple Cisco WebEx WRF Player Vulnerabilities.
Multiple buffer overflow vulnerabilities exist in the Cisco WebEx Recording Format (WRF) Player. In some cases, exploitation of the vulnerabilities could allow a remote attacker to execute arbitrary code on the system of a targeted [...]

Cisco has unveiled plans to bring its WebEx online meeting service to a new crop of smartphones.
The announcement, at Mobile World Congress, means users will be able to join Cisco WebEx Meeting Center web and audio conferences on smartphones including the BlackBerry Bold, BlackBerry Curve 8900, and BlackBerry Storm from RIM, the Nokia E71, Nokia [...]

Searching more info about Cisco WebEx Meeting Manager vulnerability, I have found this exploit. Only for test.