Cisco advises users to lock down WebEx to prevent snooping

Companies may publicly list a meeting for webinars that anyone can join, but "if your WebEx site administrator or IT department allows listed meetings, then we recommend listing your meeting only if there is a true business reason," Lewis wrote.

Another tip is to disable the option "join before host," which will then give the host visibility on who has joined. Also, setting the "host as presenter" prevents someone else form joining the meeting and sharing content, Lewis wrote.

Krebs wrote he found meetings not protected by a password from a host of companies and organizations, including Charles Schwab, CSC, CBS, CVS, The U.S. Department of Energy, Fannie Mae, Jones Day, Orbitz, Paychex Services and Union Pacific.

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