What’s Vulnerable › Vulnerabilities

CVE-2026-71862: Checkmate: Sensitive Bearer Token Exposure via Public Status Pages When showURL Setting is Enabled

• Severity: high (CVSS 7.5 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: 2026-08-21 · updated 2026-10-14
• Weakness: CWE-200

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.

Affected products

• bluewave-labs Checkmate: from 3.3.0, < 3.9.2

References

• 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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