---
id: CVE-2026-85390
title: >-
  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
summary: >-
  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 a…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L'
cwe:
  - CWE-862
published: '2026-09-03'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T15:53:23.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85390'
references:
  - url: 'https://github.com/bluewave-labs/Checkmate'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/checkRoutes.ts
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/maintenanceWindowRoutes.ts
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/bluewave-labs/Checkmate/blob/v3.11.0/server/src/api/routes/notificationRoutes.ts
    label: disclosure@vulncheck.com
  - url: 'https://github.com/bluewave-labs/Checkmate/issues/3916'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/checkmate-through-3.11.0-missing-authorization-on-maintenance-window-notification-and-check-deletion-routes
    label: disclosure@vulncheck.com
  - url: 'https://github.com/bluewave-labs/Checkmate/issues/3916'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00486
epssPercentile: 0.39221
ingestedAt: '2026-09-05T20:44:37.748Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.