CVE-2026-8066 Hitachi Energy RTU500 - Directory Traversal

Hitachi Energy RTU500 contains a directory traversal vulnerability in the file upload functionality, letting unauthenticated attackers write or overwrite arbitrary files on the device file system, exploit requires no authentication.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.74% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Directory Traversal
Impact
File System Write, Data Tampering, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-23

Vendor fix

Update to the latest version with the vulnerability fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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