CVE-2026-8065

{"id": "CVE-2026-8065", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-8065", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-29T15:53:38.135052Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cybersecurity@hitachienergy.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "affected": [{"source": "cybersecurity@hitachienergy.com", "affectedData": [{"vendor": "Hitachi Energy", "product": "RTU500 series CMU firmware", "versions": [{"status": "affected", "version": "9.0", "lessThan": "12.0", "versionType": "custom"}], "defaultStatus": "unaffected"}]}], "published": "2026-09-29T10:17:13.110", "references": [{"url": "https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch", "source": "cybersecurity@hitachienergy.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "cybersecurity@hitachienergy.com", "description": [{"lang": "en", "value": "CWE-306"}]}], "descriptions": [{"lang": "en", "value": "An authentication bypass vulnerability in the firmware update endpoint of Hitachi Energy RTU500 end-of-life versions allows an unauthenticated attacker to upload arbitrary firmware through a crafted POST request. Successful exploitation could allow the attacker to modify device functionality or compromise the integrity or availability of the device."}], "lastModified": "2026-09-29T21:39:02.570", "sourceIdentifier": "cybersecurity@hitachienergy.com"}