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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. In versions from 3.5.1 and prior, a mass assignment vulnerability in Checkmate's user profile update endpoint allows any authenticated user to escalate their privileges to superadmin, bypassing all role-based access controls. An attacker can modify their user role to gain complete administrative access to the application, including the ability to view all users, modify critical configurations, and access sensitive system data. At time of publication, there are no publicly available patches.

PUBLISHED Reserved 2026-03-09 | Published 2026-03-20 | Updated 2026-03-20 | Assigner GitHub_M




HIGH: 8.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem types

CWE-285: Improper Authorization

CWE-269: Improper Privilege Management

Product status

<= 3.5.1
affected

References

github.com/...ckmate/security/advisories/GHSA-6368-x7wr-wpm2

cve.org (CVE-2026-31836)

nvd.nist.gov (CVE-2026-31836)

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