CVE-2017-18901: 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 4.1.0, 4.0.4, and 3.10.3. It allows attackers to discover a team invite ID by requesting a JSON document.

Affected products

• Mattermost Mattermost Server: before 3.10.3 (fixed in 3.10.3); from 4.0.0, before 4.0.4 (fixed in 4.0.4)

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