CVE-2026-8065
CRITICAL
NVD
CVSS Score
9.1
Severity
CRITICAL
Published
Sep 29, 2026
Vendor
unknown
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.