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CVE-2026-31836— Mass Assignment Privilege Escalation in Checkmate

Quick assessment

Affected
bluewave-labs Checkmate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Checkmate是BlueWave开源的一个开源、自托管的工具，旨在通过精美的可视化实时跟踪和监控服务器硬件、正常运行时间、响应时间和事件。 Checkmate 3.5.1及之前版本存在授权问题漏洞，该漏洞源于用户配置文件更新端点存在大规模分配漏洞，可能导致任何经过身份验证的用户将其权限提升为超级管理员。

CVSS 8.1 · High EPSS 0.36% · P28
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I. Basic Information for CVE-2026-31836

Vulnerability Information
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Vulnerability Title
Mass Assignment Privilege Escalation in Checkmate
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Checkmate 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Checkmate是BlueWave开源的一个开源、自托管的工具，旨在通过精美的可视化实时跟踪和监控服务器硬件、正常运行时间、响应时间和事件。 Checkmate 3.5.1及之前版本存在授权问题漏洞，该漏洞源于用户配置文件更新端点存在大规模分配漏洞，可能导致任何经过身份验证的用户将其权限提升为超级管理员。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
bluewave-labs Checkmate <= 3.5.1 -

II. Public POCs for CVE-2026-31836

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III. Intelligence Information for CVE-2026-31836

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Vendor Advisories for CVE-2026-31836 (1)

IV. Related Vulnerabilities

Same product: Checkmate
Same vendor: bluewave-labs
Same weakness: CWE-285

V. Comments for CVE-2026-31836

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