CVE-2017-18919: Mattermost Server

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Server before 3.7.0 and 3.6.3. Attackers can use the API for unauthenticated team creation.

Affected products

• Mattermost Mattermost Server: before 3.6.3 (fixed in 3.6.3)

Published 2020-06-19. Last modified 2026-06-17.