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CVE-2026-85390

Checkmate through 3.11.0 Missing Authorization on Maintenance Window, Notification, and Check Deletion Routes

HIGH
7.1
CVSS Score
Published: September 3, 2026 at 06:54 PM UTC
Updated: September 10, 2026 at 04:18 PM UTC
1 product affected across 1 vendorCheckmate

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Severity
HIGH7.1
Exploit prediction
EPSS 0.5%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Checkmate· Bluewave
60%
v ≤ 3.11.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (6)

Issue Tracking
Source: cverecord
https://github.com/bluewave-labs/Checkmate/issues/3916
Product
Source: cverecord
https://github.com/bluewave-labs/Checkmate
Technical Description
Source: cverecord
https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/maintenanceWindowRoutes.ts
Technical Description
Source: cverecord
https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/notificationRoutes.ts
Technical Description
Source: cverecord
https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/checkRoutes.ts
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/checkmate-through-3.11.0-missing-authorization-on-maintenance-window-notification-and-check-deletion-routes

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-862

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