CVE-2018-21253: 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 5.1, 5.0.2, and 4.10.2. An attacker could use the invite_people slash command to invite a non-permitted user.

Affected products

• Mattermost Mattermost Server: before 4.10.2 (fixed in 4.10.2); from 5.0.0, before 5.0.2 (fixed in 5.0.2); version 5.1.0 only

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