CVE-2025-3228: Mattermost Server

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

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly retrieve requestorInfo from playbooks handler for guest users which allows an attacker access to the playbook run.

Affected products

• Mattermost Mattermost Server: from 9.11.0, before 9.11.16 (fixed in 9.11.16); from 10.5.0, before 10.5.6 (fixed in 10.5.6); from 10.6.0, before 10.6.6 (fixed in 10.6.6); from 10.7.0, before 10.7.3 (fixed in 10.7.3); version 10.8.0 only

Published 2025-06-20. Last modified 2026-06-17.