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{"criteria": "cpe:2.3:a:checkmk:checkmk:2.4.0:p8:*:*:*:*:*:*", "matchCriteriaId": "1A94395D-DDCE-4977-89CA-46F71C3CA2B8", "vulnerable": true}, {"criteria": "cpe:2.3:a:checkmk:checkmk:2.4.0:p9:*:*:*:*:*:*", "matchCriteriaId": "9513876C-8DF0-4A59-864F-8401BAA43376", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper neutralization of input in Checkmk versions 2.4.0 before 2.4.0p22, and 2.3.0 before 2.3.0p43 allows an attacker that can manipulate a host's check output to inject malicious JavaScript into the Synthetic Monitoring HTML logs, which can then be accessed via a crafted phishing link."}, {"lang": "es", "value": "La neutralizaci\u00f3n incorrecta de la entrada en las versiones de Checkmk 2.4.0 anteriores a la 2.4.0p22, y 2.3.0 anteriores a la 2.3.0p43 permite a un atacante que puede manipular la salida de verificaci\u00f3n de un host inyectar JavaScript malicioso en los registros HTML de Monitoreo Sint\u00e9tico, a los que se puede acceder posteriormente a trav\u00e9s de un enlace de phishing manipulado."}], "id": "CVE-2025-64999", "lastModified": "2026-03-05T15:16:10.623", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.3, "baseSeverity": "HIGH", "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": "LOW", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/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": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@checkmk.com", "type": "Secondary"}]}, "published": "2026-02-26T11:16:02.203", "references": [{"source": "security@checkmk.com", "tags": ["Vendor Advisory"], "url": "https://checkmk.com/werk/19238"}, {"source": "security@checkmk.com", "url": "https://github.com/sbaresearch/advisories/tree/e72ce9bb6b9ffffc1fc35e4d8152ad153293c851/2025/SBA-ADV-20251118-01_Checkmk_Cross_Site_Scripting"}], "sourceIdentifier": "security@checkmk.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security@checkmk.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.4.0,2.4.0p22)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.3.0,2.3.0p43)"}}], "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": "2026-04-20T16:32:17.829842+00:00", "value": {"mitigation_remediation": ["Upgrade to Checkmk 2.4.0p22 or later, or to Checkmk 2.3.0p43 or later, depending on the installed release.", "Limit or restrict local or privileged access to the host check output that generates Synthetic Monitoring logs so that only authorized users can modify it.", "Apply a content\u2011security policy that blocks inline script execution in the Synthetic Monitoring HTML logs to reduce the impact of any residual XSS injection."], "summary": {"action": "Immediate Patch", "impact": "Cross\u2011site scripting enabling arbitrary JavaScript execution that can be used for phishing or session hijacking"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Checkmk releases 2.4.0 and earlier versions prior to patch 2.4.0p22, and releases 2.3.0 and earlier versions prior to patch 2.3.0p43. The affected vendor is Checkmk GmbH and the product name is Checkmk.", "description_and_impact": "An attacker who can manipulate the output of a host check can inject untrusted JavaScript into Synthetic Monitoring HTML logs. This flaw is an instance of improper input neutralization (CWE\u201179) and can lead to arbitrary script execution when users view the logs. The injected code can be used in a crafted phishing link to compromise user credentials or perform other malicious actions.", "risk_and_exploitability": "The CVSS score of 7.3 indicates a high\u2011severity flaw, while the EPSS score of less than\u00a01% suggests that the likelihood of widespread active exploitation is currently low. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires that an attacker can modify host check output\u2014typically requiring privileged or local access. Once the payload is injected, the flaw can be abused via a crafted phishing link that delivers the malicious JavaScript to any user who views the Synthetic Monitoring logs."}}}}, "created": "2026-02-27T09:07:37.589176+00:00", "updated": "2026-04-20T16:45:11.948003+00:00", "vendors": ["checkmk", "checkmk$PRODUCT$checkmk"]}