CVE-2023-45316: Mattermost Server

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Mattermost fails to validate if a relative path is passed in /plugins/playbooks/api/v0/telemetry/run/<telem_run_id> as a telemetry run ID, allowing an attacker to use a path traversal payload that points to a different endpoint leading to a CSRF attack.

Affected products

• Mattermost Mattermost Server: up to and including 7.8.14; from 8.0.0, up to and including 8.1.5; from 9.0.0, up to and including 9.0.3; from 9.1.1, up to and including 9.1.2; from 9.2.0, up to and including 9.2.1

Published 2023-12-12. Last modified 2026-06-17.