CVE-2019-20879: Mattermost Server

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. Changes to e-mail addresses do not require credential re-entry.

Affected products

• Mattermost Mattermost Server: before 4.10.7 (fixed in 4.10.7); from 5.6.0, before 5.6.5 (fixed in 5.6.5); from 5.7.0, before 5.7.2 (fixed in 5.7.2); version 5.8.0 only

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