CVE-2023-3582: Mattermost Server

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Mattermost fails to verify channel membership when linking a board to a channel allowing a low-privileged authenticated user to link a Board to a private channel they don't have access to, 

Affected products

• Mattermost Mattermost Server: from 7.8.0, before 7.8.7 (fixed in 7.8.7); from 7.9.0, before 7.9.5 (fixed in 7.9.5); from 7.10.0, before 7.10.3 (fixed in 7.10.3)

Published 2023-07-17. Last modified 2026-06-17.