CVE-2019-20856: Mattermost Desktop

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Desktop App before 4.3.0 on macOS. It allows dylib injection.

Affected products

• Mattermost Mattermost Desktop: before 4.3.0 (fixed in 4.3.0)

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