CVE-2025-44004: Mattermost Confluence

High severity, CVSS 7.2. EPSS: 0.2% chance of exploitation in the next 30 days.

Mattermost Confluence Plugin version <1.5.0 fails to check the authorization of the user to the Mattermost instance which allows attackers to create a channel subscription without proper authorization via API call to the create channel subscription endpoint.

Affected products

• Mattermost Confluence: before 1.5.0 (fixed in 1.5.0)

Published 2025-08-11. Last modified 2026-06-17.