CVE-2026-71862: Checkmate: Sensitive Bearer Token Exposure via Public Status Pages When showURL Setting is Enabled
Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. From 3.3.0 until 3.9.2, enabling the global showURL setting causes the unauthenticated GET /api/v1/status-page/:url endpoint to return complete monitor objects from server/src/controllers/statusPageController.ts. The response includes the secret field used by HttpProvider.ts as an HTTP Authorization credential, even though BaseStatusPage.tsx does not display that value, allowing visitors to extract credentials from the JSON response and use them against monitored services. This issue is fixed in version 3.9.2.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Checkmateto a version that resolves this vulnerability.Fixed in 3.9.2
Event History
Frequently Asked Questions
Which deployments are exposed?
Checkmate deployments from 3.3.0 through 3.9.2 are exposed when the global showURL setting is enabled. The affected status-page API endpoint is unauthenticated, so public visitors can retrieve the data.
What does an attacker need to exploit this issue?
An attacker only needs network access to the public status-page endpoint and its URL. No account, privileges, or user interaction are required.
What can be exposed and how could it be used?
The endpoint returns complete monitor objects, including the secret field used by HttpProvider.ts as an HTTP Authorization credential. An attacker can extract that credential from the JSON response and use it against the monitored service.
What should be done if an immediate upgrade is not possible?
Disable the global showURL setting to prevent the affected endpoint behavior. Treat credentials configured in monitor secret fields as potentially exposed and rotate them where appropriate.
What version fixes the issue?
The issue is fixed in Checkmate version 3.9.2.