CVE-2023-2788: Mattermost

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Mattermost fails to check if an admin user account active after an oauth2 flow is started, allowing an attacker with admin privileges to retain persistent access to Mattermost by obtaining an oauth2 access token while the attacker's account is deactivated.

Affected products

• Mattermost Mattermost: from 7.1.0, up to and including 7.1.9; from 7.8.0, up to and including 7.8.4; from 7.9.0, up to and including 7.9.3; version 7.10.0 only

Published 2023-06-16. Last modified 2026-06-17.