A couple weeks ago a patch came out for WebEx Meeting Manager for Internet Explorer. Symantec’s Security Response Blog is reporting sightings of exploits for this vulnerability in the wild.
Users running the vulnerable version of the Webex control who happened upon a Web site distributing the exploit would become infected. The first exploits that we have seen so far have been served via gaming sites that have had the exploit package injected on to them
Computers will be patched automatically if they connect to a patched WebEx server. Otherwise you can install WebEx Meeting Manager from the WebEx website or just uninstall via Add/Remove Programs in the Control Panel.