Vulnerability Intelligence Report
CVE-2026-8066
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.
No Active Exploit Signals
CVSS Base Score
9.1
CRITICAL
Exploitability:3.9
Impact Score:5.2
EPSS Probability:1.16%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-23 ↗CWE-23 Relative path traversal
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Hitachi Energy | RTU500 series CMU firmware | 9.0 < 12.0 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
1.157%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Hitachi Energy |
| Reserved | 2026-05-07T05:51:57 |
| Published | 2026-09-29T09:24:05 |
| Last Updated | 2026-09-29T15:52:33 |
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