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Vulnerability Spotlight: Zoom Communications User Enumeration

Video conferencing and calling software has spiked in popularity as individuals across the globe are forced to stay home due to the COVID-19 pandemic. There are a plethora of players in this space, with one or two getting increased attention. One service in particular — Zoom — has received an enormous amount of attention from the media and users.

Today, Cisco Talos is disclosing a user enumeration vulnerability in Zoom Communications that could allow a malicious user to obtain a complete list of Zoom users inside a specific organization. There has been a lot of discussion around what is and is not a vulnerability and what security features should exist in video conferencing software. This is not the purpose of this blog. This disclosure is made in accordance with our vulnerability disclosure policy, in the interests of ensuring the security and privacy of users at-large against this information disclosure vulnerability.


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