{"id":"CVE-2026-8066","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-8066","generatedAt":"2026-10-28T04:14:21.211Z","title":"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.","description":"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.","published":"2026-09-29T10:17:13.000Z","lastModified":"2026-09-29T21:39:03.000Z","status":"Awaiting Analysis","sourceIdentifier":"cybersecurity@hitachienergy.com","cvss":{"version":"3.1","score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"},"cwe":["CWE-23"],"affected":[],"epss":{"score":0.00736,"percentile":0.54266,"date":"2026-10-27","history":[{"date":"2026-09-29","score":0.01157,"percentile":0.658}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.74%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T10:17:13.000Z","detail":{"score":"9.1","severity":"CRITICAL","publishedAt":"2026-09-29T10:17:13.250Z"},"summary":"New CVE, critical severity (CVSS 9.1)."}],"references":[{"url":"https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch","source":"cybersecurity@hitachienergy.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-8066","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}