CVE-2023-2783: Mattermost

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

Mattermost Apps Framework fails to verify that a secret provided in the incoming webhook request allowing an attacker to modify the contents of the post sent by the Apps.

Affected products

• Mattermost Mattermost: from 7.8.0, up to and including 7.8.4; from 7.9.0, up to and including 7.9.3; version 7.10.0 only

Published 2023-06-16. Last modified 2026-06-17.