CVE-2022-3257: Mattermost Server

Medium severity, CVSS 6.5. EPSS: 1.3% chance of exploitation in the next 30 days.

Mattermost version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.

Affected products

• Mattermost Mattermost Server: before 7.2.0 (fixed in 7.2.0)

Published 2022-09-23. Last modified 2026-06-17.