CVE-2026-8066

Published Sep 29, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Directory Traversal Allowing Arbitrary File Write in Hitachi Energy RTU500 Firmware
Type Values Removed Values Added
Title Directory Traversal Allowing Arbitrary File Write in Hitachi Energy RTU500 Firmware
Type Values Removed Values Added
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.
Weaknesses CWE-23
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'}

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
Hitachi Energy
Published
Updated
Sep 29, 2026, 3:52 PM
Reserved
May 7, 2026, 5:51 AM
Status
Awaiting Analysis
Published
Sep 29, 2026, 10:17 AM
Modified
Sep 29, 2026, 9:39 PM