CVE-2024-9155: Mattermost Server

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

Mattermost versions 9.10.x <= 9.10.1, 9.9.x <= 9.9.2, 9.5.x <= 9.5.8 fail to limit access to channels files that have not been linked to a post which allows an attacker to view them in channels that they are a member of.

Affected products

• Mattermost Mattermost Server: from 9.5.0, before 9.5.9 (fixed in 9.5.9); from 9.9.0, before 9.9.3 (fixed in 9.9.3); from 9.10.0, before 9.10.2 (fixed in 9.10.2)

Published 2024-09-26. Last modified 2026-06-17.