A vulnerability in Cisco WebEx browser extensions can allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the affected browser on an affected system. This vulnerability affects the browser extensions for Cisco WebEx Meetings Server and Cisco WebEx Meetings Center when they are running on Microsoft Windows. The vulnerability is due to a design defect in an application programing interface (API) response parser within the plugin. Affected Software: Cisco WebEx browser extension prior to 1.0.7
In case you haven't seen this, here is the bulletin from Cisco:
Cisco WebEx Browser Extension Remote Code Execution Vulnerability