CVE-2023-1774: Mattermost Server

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

When processing an email invite to a private channel on a team, Mattermost fails to validate the inviter's permission to that channel, allowing an attacker to invite themselves to a private channel.

Affected products

• Mattermost Mattermost Server: before 7.1.6 (fixed in 7.1.6); version 7.7.1 only

Published 2023-03-31. Last modified 2026-06-17.