CVE-2023-3587: Mattermost Server

Low severity, CVSS 2.7. EPSS: 0.4% chance of exploitation in the next 30 days.

Mattermost fails to properly show information in the UI, allowing a system admin to modify a board state allowing any user with a valid sharing link to join the board with editor access, without the UI showing the updated permissions.

Affected products

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

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