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CVE record · CVE-2026-8066

Path traversal in Hitachi Energy RTU500 series CMU firmware

CVSS 9.1 CriticalCriticalEPSS 0.0074 · 54th percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the CVE Program (CNA: Hitachi Energy) at 29 Sept 2026, 09:24 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Hitachi Energy RTU500 series CMU firmware
  • affected 9.0 to before 12.0 custom
Other versions: unaffected
Identifiers
CVE-2026-8066
CNA
Hitachi Energy
Weakness (CWE)
CWE-23
Tags
Published
29 Sept 2026
Updated
29 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H CNA (Hitachi Energy)
  • CISA KEV Not listed.
  • EPSS 0.0074, the 54th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 29 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.