CVE-2023-5331: Mattermost Server

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Mattermost fails to properly check the creator of an attached file when adding the file to a draft post, potentially exposing unauthorized file information.

Affected products

• Mattermost Mattermost Server: before 7.8.11 (fixed in 7.8.11); from 8.0.0, before 8.0.3 (fixed in 8.0.3); from 8.1.0, before 8.1.2 (fixed in 8.1.2)

Published 2023-10-09. Last modified 2026-06-17.