{"id":"CVE-2026-8065","aliases":["EUVD-2026-88666","GHSA-gg49-9mrv-ff3f"],"status":"published","title":"An authentication bypass vulnerability in the firmware update endpoint of Hitachi Energy RTU500...","description":"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.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00494,"percentile":0.42908,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-306"],"published":"2026-09-29T09:20:07Z","modified":"2026-09-29T21:39:02Z","exploits":[{"source":"pocgithub","id":"murrez/CVE-2026-8065","title":"murrez/CVE-2026-8065","date":"2026-09-29","url":"https://github.com/murrez/CVE-2026-8065"}],"products":[{"vendor":"hitachi energy","product":"rtu500 series cmu firmware"}],"references":[{"url":"https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251\u0026LanguageCode=en\u0026DocumentPartId=\u0026Action=Launch"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8065"},{"url":"https://github.com/advisories/GHSA-gg49-9mrv-ff3f"}],"sources":{"cve":[{"id":"CVE-2026-8065","description":"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.","status":"published","published":"2026-09-29T09:20:07.276Z","modified":"2026-09-29T15:54:11.55Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T13:48:02.226896Z"}],"euvd":[{"id":"EUVD-2026-88666","description":"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.","status":"published","published":"2026-09-29T09:20:07Z","modified":"2026-09-29T15:54:11Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T17:27:51.995341Z"}],"ghsa":[{"id":"GHSA-gg49-9mrv-ff3f","title":"An authentication bypass vulnerability in the firmware update endpoint of Hitachi Energy RTU500...","description":"An authentication bypass vulnerability in the firmware update endpoint of Hitachi Energy RTU500 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.","status":"published","published":"2026-09-29T12:31:30Z","modified":"2026-09-29T12:31:38Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:12:33.186319Z"}],"nvd":[{"id":"CVE-2026-8065","description":"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.","status":"published","published":"2026-09-29T10:17:13.11Z","modified":"2026-09-29T21:39:02.57Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:12:52.413234Z"}]}}