EUVD-2026-63321
GHSA-c84g-3xmv-j872
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/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
AC:H reflects the AT:P prerequisite (frozen BI aggregations must be configured); PR:L for authenticated access; confidentiality only, limited to metadata.
Primary rating from Vendor (Checkmk).
CVSS VectorVendor: Checkmk
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/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
2DescriptionCVE.org
Incorrect authorization in frozen BI aggregations in Checkmk <2.5.0p2, <2.4.0p29, <2.3.0p47, and all 2.2.0 versions allows an authenticated user with restricted host and service visibility to learn the names and the existence of hosts and services they are not authorized to see.
AnalysisAI
Incorrect authorization in Checkmk's frozen BI (Business Intelligence) aggregation feature exposes host and service names to authenticated users whose visibility should be restricted. Specifically, users with intentionally scoped permissions can infer the existence and names of hosts and services outside their authorized scope by querying frozen BI aggregations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) a valid Checkmk account with at least low-privilege access (PR:L confirmed by CVSS vector), (2) the Checkmk installation must have the BI module configured with frozen aggregations enabled and in use (AT:P - attack requirement present; this is a non-default feature state requiring deliberate configuration), and (3) the attacker's account must have restricted host/service visibility configured via Checkmk's role and permission system - the vulnerability only manifests in multi-tenancy or compartmentalized deployments. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated Checkmk user whose role restricts visibility to a subset of hosts and services - such as a contractor or a team member with scoped access - queries frozen BI aggregation views through the Checkmk web interface or API. The authorization check fails to enforce the user's scope filter on the frozen aggregation data, revealing the names and existence of hosts and services the user is not permitted to see. … |
| Remediation | Upgrade Checkmk to 2.3.0p47, 2.4.0p29, or 2.5.0p2 or later, depending on the deployed release branch, as documented in the vendor advisory at https://checkmk.com/werk/16917. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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