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different HTTP response codes in agent-receiver/register_existing endpoint, which could lead to information disclosure."}], "id": "CVE-2026-24097", "lastModified": "2026-03-18T13:37:29.700", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@checkmk.com", "type": "Secondary"}]}, "published": "2026-03-13T19:54:16.060", "references": [{"source": "security@checkmk.com", "tags": ["Vendor Advisory"], "url": "https://checkmk.com/werk/18993"}], "sourceIdentifier": "security@checkmk.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-204"}], "source": "security@checkmk.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.4.0,2.4.0p23)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.3.0,2.3.0p43)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.2.0"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Checkmk", "source": "cna", "vendor": "Checkmk GmbH"}, "product": "checkmk", "vendor": "checkmk"}], "analysis": {"en": {"generated_at": "2026-03-18T14:35:53.885269+00:00", "value": {"mitigation_remediation": ["Upgrade your Checkmk installation to a patched version (\u2265\u202f2.4.0p23 or \u2265\u202f2.3.0p43).", "After upgrading, verify that the agent-receiver/register_existing endpoint behaves consistently for all requests, regardless of whether the host exists.", "Monitor system logs for repeated access to the register_existing endpoint that may indicate enumeration attempts."], "summary": {"action": "Patch", "impact": "Information disclosure"}, "threat_synthesis": {"affected_systems": "The affected product is Checkmk Software from Checkmk GmbH. Vulnerable releases include all Checkmk 2.4.0 builds prior to 2.4.0p23, all Checkmk 2.3.0 builds prior to 2.3.0p43, and the End\u2011of\u2011Life 2.2.0 branch.", "description_and_impact": "Improper permission enforcement in Checkmk allows authenticated users to discover which hosts already exist by observing differing HTTP response codes returned from the agent-receiver/register_existing endpoint. The vulnerability, identified as CWE\u2011204, can enable an attacker with valid credentials to enumerate the infrastructure and gather host inventory information that should not be publicly disclosed.", "risk_and_exploitability": "The CVSS v3 score is 5.3 (moderate). The EPSS score is below 1\u202f%, indicating a low probability of exploitation in the wild, and the vulnerability is not listed in the CISA KEV catalog. Attackers require valid user credentials \u2013 they must be able to authenticate to the Checkmk server \u2013 to trigger the endpoint and observe the response variations. Successful exploitation would provide the attacker with a list of existing hosts, facilitating further reconnaissance or targeted attacks against the enumerated infrastructure."}}}}, "created": "2026-03-16T09:37:46.253750+00:00", "updated": "2026-03-23T09:59:32.242784+00:00", "vendors": ["checkmk", "checkmk$PRODUCT$checkmk"]}