CVE-2024-43780: Mattermost Server

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

Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.0, 9.8.x <= 9.8.2 fail to enforce permissions which allows a guest user with read access to upload files to a channel.

Affected products

• Mattermost Mattermost Server: from 9.5.0, before 9.5.8 (fixed in 9.5.8); from 9.8.0, before 9.8.3 (fixed in 9.8.3); from 9.9.0, before 9.9.2 (fixed in 9.9.2); version 9.10.0 only

Published 2024-08-22. Last modified 2026-06-17.