CVE-2026-8833

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"0405E40E-7969-49B3-90EC-98A982464275", "vulnerable": true}, {"criteria": "cpe:2.3:a:checkmk:checkmk:2.5.0:p3:*:*:*:*:*:*", "matchCriteriaId": "629E039F-1C52-48DF-A952-11220A890AC2", "vulnerable": true}, {"criteria": "cpe:2.3:a:checkmk:checkmk:2.5.0:p4:*:*:*:*:*:*", "matchCriteriaId": "CDC5BD88-F1D9-4ED4-81AA-3E6CD9AF16A8", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper neutralization of HTML-encoded characters in the URL validation function in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an authenticated user to bypass URL validation and inject malicious URLs such as javascript: URIs, resulting in cross-site scripting when another user interacts with the crafted link."}, {"lang": "es", "value": "La neutralizaci\u00f3n inadecuada de caracteres codificados en HTML en la funci\u00f3n de validaci\u00f3n de URL en Checkmk versiones anteriores a 2.5.0p5, anterior a 2.4.0p31, anterior a 2.3.0p48 y todas las versiones 2.2.0 permite a un usuario autenticado eludir la validaci\u00f3n de URL e inyectar URL maliciosas como URI javascript:, lo que resulta en cross-site scripting cuando otro usuario interact\u00faa con el enlace manipulado."}], "id": "CVE-2026-8833", "lastModified": "2026-10-23T21:10:00.157", "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": "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-2026-8833", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-08T13:02:39.672018Z", "version": "2.0.3"}}]}, "published": "2026-06-08T13:16:33.900", "references": [{"source": "security@checkmk.com", "tags": ["Vendor Advisory"], "url": "https://checkmk.com/werk/20002"}], "sourceIdentifier": "security@checkmk.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security@checkmk.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.5.0,2.5.0p5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.4.0,2.4.0p31)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[2.3.0,2.3.0p48)"}}, {"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"}], "created": "2026-06-08T14:45:03.838515+00:00", "updated": "2026-06-08T14:45:04.124618+00:00", "vendors": ["checkmk", "checkmk$PRODUCT$checkmk"]}