CVE-2019-20853: Mattermost Packages

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Packages before 5.16.3. A Droplet could allow Internet access to a service that has a remote code execution problem.

Affected products

• Mattermost Mattermost Packages: before 5.16.3 (fixed in 5.16.3)

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