CVE-2023-1775: Exposure of Resource to Wrong Sphere

March 31, 2023 (updated April 7, 2023)

When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.

References

github.com/advisories/GHSA-8jhh-3jf2-pfwr
mattermost.com/security-updates/
nvd.nist.gov/vuln/detail/CVE-2023-1775

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