CVE-2026-8066

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Summary

CVECVE-2026-8066
StatePUBLISHED
AssignerHitachi Energy
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-29 10:17:13 UTC
Updated2026-09-29 21:39:02 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS: 0.011570000 probability, percentile 0.658000000 (date 2026-09-29)

Problem Types: CWE-23 | CWE-23 CWE-23 Relative path traversal

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
3.1CNACVSS9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Hitachi Energy RTU500 Series CMU Firmware affected 9.0 12.0 custom Not specified

References

ReferenceSourceLinkTags
publisher.hitachienergy.com/preview [email protected] publisher.hitachienergy.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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