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Vulnerability record · CVE-2026-71862 · published 21 August 2026

CVE-2026-71862: Information exposure vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.48% · top 60.9% CWE-200 · Information exposureCWE-522 · Insufficiently protected credentials Deferred
7.5CVSS 3.1 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
18 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
https://github.com/bluewave-labs/Checkmate/commit/cc1814f507041bb0f64845bed5d5442c21e920f2
https://github.com/bluewave-labs/Checkmate/pull/3758
https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.2
https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-3m74-8cg9-rp8j

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Source: NIST National Vulnerability Database (record CVE-2026-71862), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.