CVE-2022-2406: Mattermost

Medium severity, CVSS 6.5. EPSS: 0.9% chance of exploitation in the next 30 days.

The legacy Slack import feature in Mattermost version 6.7.0 and earlier fails to properly limit the sizes of imported files, which allows an authenticated attacker to crash the server by importing large files via the Slack import REST API.

Affected products

• Mattermost Mattermost: up to and including 6.3.8; from 6.4.0, up to and including 6.5.1; version 6.6.0 only; version 6.6.1 only; version 6.7.0 only

Published 2022-07-14. Last modified 2026-06-17.