CVE-2026-8065 Hitachi Energy RTU500 - Authentication Bypass

Hitachi Energy RTU500 contains an authentication bypass caused by improper validation in the firmware update endpoint, letting unauthenticated attackers upload arbitrary firmware, exploit requires crafted POST request.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.58% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
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-306

Vendor fix

Update to the latest firmware version that patches this vulnerability.

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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