CVE-2019-20881: Mattermost Server

High severity, CVSS 7.3. EPSS: 0.8% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Server before 5.8.0. It mishandles brute-force attacks against MFA.

Affected products

• Mattermost Mattermost Server: before 5.8.0 (fixed in 5.8.0)

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