CVE-2023-48732: Exposure of Sensitive Information to an Unauthorized Actor

January 2, 2024 (updated January 3, 2024)

Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel.

References

github.com/advisories/GHSA-q7rx-w656-fwmv
github.com/mattermost/mattermost/commit/851515be222160bee0a495c0d411056b19ed4111
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2023-48732

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