CVE-2025-24526: Mattermost Server

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

Mattermost versions 10.1.x <= 10.1.3, 10.4.x <= 10.4.1, 9.11.x <= 9.11.7, 10.3.x <= 10.3.2, 10.2.x <= 10.2.2 fail to restrict channel export of archived channels when the "Allow users to view archived channels" is disabled which allows a user to export channel contents when they shouldn't have access to it

Affected products

• Mattermost Mattermost Server: from 9.11.0, before 9.11.8 (fixed in 9.11.8); from 10.1.0, before 10.1.4 (fixed in 10.1.4); from 10.2.0, before 10.2.3 (fixed in 10.2.3); from 10.3.0, before 10.3.3 (fixed in 10.3.3); from 10.4.0, before 10.4.2 (fixed in 10.4.2)

Published 2025-02-24. Last modified 2026-06-17.