CVE-2022-2408: Mattermost

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

The Guest account feature in Mattermost version 6.7.0 and earlier fails to properly restrict the permissions, which allows a guest user to fetch a list of all public channels in the team, in spite of not being part of those channels.

Affected products

• Mattermost Mattermost: before 6.3.8 (fixed in 6.3.8); from 6.4.0, up to and including 6.5.1; version 6.6.0 only; version 6.6.1 only; version 6.7.0 only

Published 2022-07-14. Last modified 2026-06-17.