CVE-2023-3591: Mattermost Server

High severity, CVSS 8.2. EPSS: 0.3% chance of exploitation in the next 30 days.

Mattermost fails to invalidate previously generated password reset tokens when a new reset token was created.

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.