CVE-2026-23518

{"id": "CVE-2026-23518", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23518", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-01-22T15:13:36.673554Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 9.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "fleetdm", "product": "fleet", "versions": [{"status": "affected", "version": ">= 4.78.0, < 4.78.3"}, {"status": "affected", "version": ">= 4.77.0, < 4.77.1"}, {"status": "affected", "version": ">= 4.76.0, < 4.76.2"}, {"status": "affected", "version": ">= 4.75.0, < 4.75.2"}, {"status": "affected", "version": "< 4.53.3"}]}]}], "published": "2026-01-21T22:15:50.140", "references": [{"url": "https://github.com/fleetdm/fleet/commit/e225ef57912c8f4ac8977e24b5ebe1d9fd875257", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/fleetdm/fleet/security/advisories/GHSA-63m5-974w-448v", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-347"}]}], "descriptions": [{"lang": "en", "value": "Fleet is open source device management software. In versions prior to 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3, a vulnerability in Fleet's Windows MDM enrollment flow could allow an attacker to submit forged authentication tokens that are not properly validated. Because JWT signatures were not verified, Fleet could accept attacker-controlled identity claims, enabling enrollment of unauthorized devices under arbitrary Azure AD user identities. Versions 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM."}, {"lang": "es", "value": "Fleet es software de gesti\u00f3n de dispositivos de c\u00f3digo abierto. En versiones anteriores a 4.78.3, 4.77.1, 4.76.2, 4.75.2 y 4.53.3, una vulnerabilidad en el flujo de inscripci\u00f3n de MDM de Windows de Fleet podr\u00eda permitir a un atacante enviar tokens de autenticaci\u00f3n falsificados que no se validan correctamente. Debido a que las firmas JWT no se verificaban, Fleet podr\u00eda aceptar reclamaciones de identidad controladas por el atacante, permitiendo la inscripci\u00f3n de dispositivos no autorizados bajo identidades de usuario arbitrarias de Azure AD. Las versiones 4.78.3, 4.77.1, 4.76.2, 4.75.2 y 4.53.3 solucionan el problema. Si una actualizaci\u00f3n inmediata no es posible, los usuarios de Fleet afectados deber\u00edan deshabilitar temporalmente Windows MDM."}], "lastModified": "2026-06-17T10:21:42.850", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58B2870D-823A-4862-A51B-B3F86C60D89B", "versionEndExcluding": "4.53.3"}, {"criteria": "cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E363A7DF-0880-44B8-82A6-0192D1D43471", "versionEndExcluding": "4.75.2", "versionStartIncluding": "4.75.0"}, {"criteria": "cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "53B5B8B6-F8C9-45E2-A160-D5834B1F3D61", "versionEndExcluding": "4.76.2", "versionStartIncluding": "4.76.0"}, {"criteria": "cpe:2.3:a:fleetdm:fleet:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8118C02-5CB2-45D3-AE6E-90313FB29720", "versionEndExcluding": "4.78.3", "versionStartIncluding": "4.78.0"}, {"criteria": "cpe:2.3:a:fleetdm:fleet:4.77.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AE525B6A-8AF1-4D33-8EE9-FFD6A1C4F3F8"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}