CVE-2017-18872: 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 4.4.3 and 4.3.3. Attackers could reconfigure an OAuth app in some cases where Mattermost is an OAuth 2.0 service provider.

Affected products

• Mattermost Mattermost Server: before 4.3.3 (fixed in 4.3.3); from 4.4.0, before 4.4.3 (fixed in 4.4.3)

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