{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8066","assignerOrgId":"e383dce4-0c27-4495-91c4-0db157728d17","state":"PUBLISHED","assignerShortName":"Hitachi Energy","dateReserved":"2026-05-07T05:51:57.867Z","datePublished":"2026-09-29T09:24:05.830Z","dateUpdated":"2026-09-29T15:52:33.807Z"},"containers":{"cna":{"providerMetadata":{"orgId":"e383dce4-0c27-4495-91c4-0db157728d17","shortName":"Hitachi Energy","dateUpdated":"2026-09-29T12:50:58.301Z"},"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-23","description":"CWE-23 Relative path traversal","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-186","descriptions":[{"lang":"en","value":"CAPEC-186 Malicious Software Update"}]}],"affected":[{"vendor":"Hitachi Energy","product":"RTU500 series CMU firmware","versions":[{"status":"affected","version":"9.0","lessThan":"12.0","versionType":"custom"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"A directory traversal vulnerability in the file upload functionality of Hitachi Energy RTU500 end-of-life versions allows an unauthenticated attacker to write or overwrite arbitrary files on the device file system. Depending on the files affected, successful exploitation could result in unauthorized modification of device data or disruption of the device’s intended operation.","supportingMedia":[{"type":"text/html","base64":false,"value":"A directory traversal vulnerability in the file upload functionality of Hitachi Energy RTU500 end-of-life versions allows an unauthenticated attacker to write or overwrite arbitrary files on the device file system. Depending on the files affected, successful exploitation could result in unauthorized modification of device data or disruption of the device’s intended operation."}]}],"references":[{"url":"https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"CRITICAL","baseScore":9.1,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"}}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.5.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-29T15:52:09.514722Z","id":"CVE-2026-8066","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-29T15:52:33.807Z"}}]}}