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 user. The Cisco WebEx WRF Player is an application that is used to play back WebEx meeting recordings that have been recorded on the computer of an on-line meeting attendee. The WRF Player can be automatically installed when the user accesses a WRF file [...]

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 E75, Nokia N97, and other Nokia Eseries and Nseries, and the Samsung Blackjack II. They will be able to participate in audio and web conferencing via 3G or Wi-Fi, attend scheduled meetings and view presentations, applications and desktops with live annotations. In addition, Cisco [...]

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