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WebEx Completes Automatic Microsoft ActiveX Update


Update Resolved Vulnerability with Microsoft ActiveX Control Software and Delivers Added Level of Security

SANTA CLARA, Calif., July 6, 2006— To ensure the constant security of its service, WebEx (Nasdaq: WEBX) announced today the completion of an automatic update to its client software across customer sites. More then 95% of customer sites now include the latest client and users will be updated automatically when they use the service. The remaining customer sites are expected to be updated shortly.

WebEx uses ActiveX to download additional technology components needed for a meeting. This update resolved a vulnerability within the ActiveX control used to install its web meeting software. WebEx has not received any reports of computers being compromised by this now resolved vulnerability.

According to security best practices, WebEx has also provided a detailed security advisory and update tool for those who wish to manually update their client at: (For international versions of this update page please see the bottom of this release.)

WebEx conducts security tests as part of an ongoing quality assurance program. As part of that program, WebEx works with third parties including Internet Security Systems (ISS) and iSEC. ISS and iSEC played key roles in helping to identify and resolve this ActiveX vulnerability.

About WebEx
WebEx Communications Inc., is the global leader of on-demand applications for collaborative business on the web. WebEx applications combine both synchronous and asynchronous collaboration capabilities and allow businesses to leverage the web as an efficient channel for interaction with customers, partners and co-workers. These on-demand applications enhance high-touch business processes, such as sales and training, with efficient web-touch interactions. WebEx delivers its range of applications over the WebEx MediaTone Network, a global network and platform specifically designed for secure delivery of on-demand applications. WebEx is based in Santa Clara, California and has regional headquarters in Europe, Asia and Australia. Please call toll free 877-509-3239 or visit for more information.


International versions of the update page are available in French, German, Spanish, Japanese, Korean, Simplified Chinese, and Traditional Chinese

ActiveX is a registered trademark of Microsoft Corporation and MediaTone is a trademark of WebEx Communications.

This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements may be identified by use of the terms anticipates, believes, continue, could, estimates, expects, intends, may, plans, potential, predicts, should or will, or the negative of those terms or similar expressions. These forward-looking statements are subject to significant risks and uncertainties. Actual results may differ materially from those described in such statements as a result of these risks and uncertainties. In particular, these forward looking statements include, but are not limited to, statements regarding resolution of the vulnerability within ActiveX and the update of remaining customer sites. A fuller discussion of the risks and uncertainties that could affect WebEx Communications, Inc. are more fully set forth in WebEx Communications, Inc.’s filings with the Securities and Exchange Commission, including WebEx’s Form 10-Q filed with the SEC on May 9, 2006. WebEx Communications, Inc. assumes no obligation to update forward-looking information contained in this press release.


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