CVE-2023-2793: Mattermost

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Mattermost fails to validate links on external websites when constructing a preview for a linked website, allowing an attacker to cause a denial-of-service by a linking to a specially crafted webpage in a message.

Affected products

• Mattermost Mattermost: from 7.8.0, up to and including 7.8.3; from 7.9.0, up to and including 7.9.2; version 7.10.0 only

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