CVE-2023-1775: Mattermost Server

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

When running in a High Availability configuration, Mattermost fails to sanitize some of the user_updated and post_deleted events broadcast to all users, leading to disclosure of sensitive information to some of the users with currently connected Websocket clients.

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.