CVE-2016-11065: 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 3.3.0. An attacker could use the WebSocket feature to send pop-up messages to users or change a post's appearance.

Affected products

• Mattermost Mattermost Server: before 3.3.0 (fixed in 3.3.0)

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