CVE-2026-8066
CRITICAL
CVSS 9.1
Published: 2026-09-29
Modified: 2026-09-29
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Threat Intelligence Pending
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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.
Quick Facts
| CVE ID | CVE-2026-8066 |
| CVSS Score | 9.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| Published | 2026-09-29 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |