Excessive Data Exposure is a threat that can be introduced by many things, including error messages that show too much information or even displaying obfuscated information.
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In the case of Clubhouse, an API call was made resulting in the token exchange routed through the app vendor servers to establish a connection between users. The information is then sent unencrypted, containing metadata about the channel, such as whether a user has requested to join a chatroom, the user’s Clubhouse id number and whether they have muted themselves. This is where the application developers introduced an Excessive Data Exposure Threat #3 on OWASP API Top 10 list
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