CVE-2023-2831: Mattermost

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Mattermost fails to unescape Markdown strings in a memory-efficient way, allowing an attacker to cause a Denial of Service by sending a message containing a large number of escaped characters.

Affected products

• Mattermost Mattermost: from 7.1.0, up to and including 7.1.9; 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.