CVE-2017-18900: Mattermost Server

Critical severity, CVSS 9.8. EPSS: 1.3% 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 CSV injection via a compliance report.

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.