What’s Vulnerable › Vulnerabilities

CVE-2026-85390: Checkmate through 3.11.0 Missing Authorization on Maintenance Window, Notification, and Check Deletion Routes

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-03 · updated 2026-09-10
• Weakness: CWE-862

Description

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: through 3.11.0

References

• https://github.com/bluewave-labs/Checkmate
• https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/checkRoutes.ts
• https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/maintenanceWindowRoutes.ts
• https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/notificationRoutes.ts
• https://github.com/bluewave-labs/Checkmate/issues/3916
• https://www.vulncheck.com/advisories/checkmate-through-3.11.0-missing-authorization-on-maintenance-window-notification-and-check-deletion-routes
• https://github.com/bluewave-labs/Checkmate/issues/3916

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