CVE-2026-3466

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"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": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.5, "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:N/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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3466", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-07T13:18:39.707466Z", "version": "2.0.3"}}]}, "published": "2026-04-07T13:16:47.150", "references": [{"source": "security@checkmk.com", "tags": ["Vendor Advisory"], "url": "https://checkmk.com/werk/19033"}, {"source": "security@checkmk.com", "url": "https://checkmk.com/werk/19583"}, {"source": "security@checkmk.com", "tags": ["Release Notes", "Third Party Advisory"], "url": "https://www.vulncheck.com/advisories/checkmk-stored-cross-site-scripting-in-dashlet-title"}], "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": "semver", "value": "2.2.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.3.0,2.3.0p46)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.4.0,2.4.0p25)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.5.0b1,2.5.0b3)"}}], "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": "2026-04-22T15:20:36.437893+00:00", "value": {"mitigation_remediation": ["Apply the latest Checkmk release: upgrade to 2.3.0p46 or later, 2.4.0p25 or later, or the newest 2.5.0 beta or stable release; any newer version is acceptable.", "If an upgrade is not immediately possible, restrict permission to create dashboards to a minimal set of trusted administrators and audit dashboard changes.", "Consider removing or disabling the ability to use hyperlink markup in dashlet titles during the interim.", "Monitor user activity for unexpected dashboard edits and validate that shared dashboards do not contain unfamiliar links.", "Stay informed of vendor advisories and verify that the applied patch addresses the XSS issue."], "summary": {"action": "Immediate Patch", "impact": "Stored cross\u2011site scripting (XSS) via malicious dashlet title links"}, "threat_synthesis": {"affected_systems": "The flaw affects Checkmk version\u202f2.2.0 (end\u2011of\u2011life), Checkmk\u202f2.3.0 prior to\u202f2.3.0p46, Checkmk\u202f2.4.0 prior to\u202f2.4.0p25, and Checkmk\u202f2.5.0 (beta) prior to the first update; it is specific to the application delivered by Checkmk GmbH.", "description_and_impact": "Insufficient sanitization of links embedded in dashboard dashlet titles allows an attacker with dashboard\u2011creation privileges to store a malicious URL. When a victim visits the shared dashboard and clicks the crafted link, the attacker's script executes in the victim\u2019s browser, potentially stealing session information, defacing the interface or performing other malicious client\u2011side actions. The vulnerability is a classic stored XSS and can be leveraged to compromise user accounts and further spread attacks inside the organization.", "risk_and_exploitability": "The CVSS score of 8.5 classifies the issue as high severity. EPSS is below 1\u202f%, indicating that large\u2011scale exploitation is not common, and the vulnerability is not listed in the CISA KEV catalogue. Exploitation requires an attacker to create a malicious dashboard and a victim with access to the shared dashboard who clicks the injected link. The attack vector is client\u2011side; however, once the victim clicks, the attacker gains full client\u2011side control. Consequently, the risk to an organization that permits dashboard creation by multiple users is non\u2011negligible and warrants swift remediation."}}}}, "created": "2026-04-08T19:38:26.866049+00:00", "updated": "2026-04-22T15:30:20.772042+00:00", "vendors": ["checkmk", "checkmk$PRODUCT$checkmk"]}