EUVD-2026-17867Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
Insufficient permission validation on multiple REST API Quick Setup endpoints in Checkmk 2.5.0 (beta) before version 2.5.0b2 and 2.4.0 before version 2.4.0p25 allows low-privileged users to perform unauthorized actions or obtain sensitive information
AnalysisAI
Insufficient permission validation in Checkmk REST API Quick Setup endpoints allows low-privileged authenticated users to perform unauthorized administrative actions or access sensitive information in versions 2.5.0 beta before 2.5.0b2 and 2.4.0 before 2.4.0p25. The vulnerability stems from missing authorization checks that fail to enforce role-based access control on multiple API endpoints, enabling privilege escalation within the monitoring platform.
Technical ContextAI
Checkmk's REST API Quick Setup endpoints implement improper access control mechanisms that do not adequately validate user permissions before processing requests. CWE-280 (Improper Handling of Insufficient Permissions or Privileges) indicates the root cause: authorization logic either skips permission checks entirely or applies them inconsistently across endpoint handlers. The affected CPE (cpe:2.3:a:checkmk_gmbh:checkmk:*:*:*:*:*:*:*:*) encompasses all versions of Checkmk, with vulnerability exposure limited to the specific version ranges noted. The Quick Setup REST API endpoints are typically used for initial configuration workflows and likely handle sensitive operations such as user management, system configuration, and data access controls.
RemediationAI
Upgrade to Checkmk version 2.5.0b2 or later for beta environments, or upgrade to version 2.4.0p25 or later for production deployments. These versions include fixes that enforce proper permission validation on REST API Quick Setup endpoints. Users unable to patch immediately should restrict API access through network controls or role-based firewall rules to limit exposure of Quick Setup endpoints to trusted administrators only. Full advisory details and patched release information are available at https://checkmk.com/werk/18989.
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