CriticalCritical vulnerability

CVE-2026-8065 (CVSS 9.1)

NVD · officialPublished Sep 29, 2026Risk 50/100

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.

Technical details

CVSS

9.1

AV:NetworkAC:LowPR:NoneUI:NoneC:NoneI:HighA:High

Evidence and sources

This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.

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