CVE-2017-18895: 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 4.2.0, 4.1.1, and 4.0.5. It allows attackers to obtain sensitive information (user statuses) via a REST API version 4 endpoint.

Affected products

• Mattermost Mattermost Server: before 4.0.5 (fixed in 4.0.5); from 4.1.0, before 4.1.1 (fixed in 4.1.1); version 4.2.0 only

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