CVE-2020-14457: Mattermost Server

Medium severity, CVSS 5.3. EPSS: 0.9% chance of exploitation in the next 30 days.

An issue was discovered in Mattermost Server before 5.20.0. Non-members can receive broadcasted team details via the update_team WebSocket event, aka MMSA-2020-0012.

Affected products

• Mattermost Mattermost Server: before 5.20.0 (fixed in 5.20.0)

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