Cisco has fixed three Webex Meetings security vulnerabilities that would have allowed unauthenticated remote attackers to join ongoing meetings as ghost participants. IBM researchers discovered the vulnerabilities while analyzing Cisco’s collaboration tool for vulnerabilities. ‘Ghost’ users are meeting participants that can’t be seen in the user list and were not invited to the meeting, but they can hear, speak, and share media within the meeting. Cisco Webex is an online meeting and video conferencing software that can be used to schedule and join meetings. It also provides users with presentation, screen sharing, and recording capabilities.
Source: https://www.bleepingcomputer.com/news/security/cisco-fixes-webex-bugs-allowing-ghost-attackers-in-meetings/