CVE-2026-85390: Bluewave-Labs Checkmate

High severity, CVSS 7.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Checkmate through 3.11.0 omits the isAllowed role guard middleware on maintenance-window, notification, and check-deletion routes, allowing read-only users to perform administrative actions. Attackers with user-role sessions can create arbitrary maintenance windows to silence alerts, modify notification channels, and delete monitor check history to erase incident evidence.

Affected products

• Bluewave-Labs Checkmate: up to and including 3.11.0

Published 2026-09-03. Last modified 2026-09-10.