{"id":"CVE-2026-8065","title":"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","summary":"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 …","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","cwe":["CWE-306"],"vendor":"Hitachi Energy","product":"RTU500 series CMU firmware","affected":["rtu500_series_cmu_firmware >= 9.0 < 12.0"],"published":"2026-09-29","updated":"2026-09-29","sourceUpdated":"2026-09-29T21:39:02.570","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-8065","references":[{"url":"https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch","label":"cybersecurity@hitachienergy.com"}],"tags":["nvd","exploit-available","cve.org"],"epss":0.00494,"epssPercentile":0.42238,"exploits":{"github":2,"githubRepos":["https://github.com/MRdark-ops/CVE-2026-8065","https://github.com/murrez/CVE-2026-8065"],"checkedAt":"2026-10-27T19:14:51.015Z"},"exploitAvailable":true,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-29T15:53:38.135052Z"},"ingestedAt":"2026-09-29T09:30:49.084Z","slug":"CVE-2026-8065","body":"## Overview\n\nAn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":62,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":213155,"id":"CVE-2026-8065","ts":1790718617003,"field":"exploit_available","old":"false","new":"true"}]}