CVE-2025-58084: Mattermost Desktop

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Mattermost Desktop App versions <= 5.13.0 fail to validate URLs external to the configured Mattermost servers, allowing an attacker on a server the user has configured to crash the user's application by sending the user a malformed URL.

Affected products

• Mattermost Mattermost Desktop: before 5.13.1.0 (fixed in 5.13.1.0)

Published 2025-10-13. Last modified 2026-06-17.