CVE-2023-50333: Mattermost Server

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Mattermost fails to update the permissions of the current session for a user who was just demoted to guest, allowing freshly demoted guests to change group names.

Affected products

• Mattermost Mattermost Server: before 8.1.7 (fixed in 8.1.7)

Published 2024-01-02. Last modified 2026-06-17.