CVE-2025-52931: Mattermost Confluence

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to update channel subscription endpoint with an invalid request body.

Affected products

• Mattermost Confluence: before 1.5.0 (fixed in 1.5.0)

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