CVE-2024-1952: Mattermost Server

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Mattermost version 8.1.x before 8.1.9 fails to sanitize data associated with permalinks when a plugin updates an ephemeral post, allowing an authenticated attacker who can control the ephemeral post update to access individual posts' contents in channels they are not a member of.

Affected products

• Mattermost Mattermost Server: from 8.1.0, before 8.1.9 (fixed in 8.1.9)

Published 2024-02-29. Last modified 2026-06-17.