Hitachi Energy RTU500 Missing Authorization (CVE-2026-8067)

medium Tenable OT Security Plugin ID 506487

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An improper authorization vulnerability in the RTU500's web application allows an authenticated user to trigger the RTU500 to reboot through the reset endpoint. Successful exploitation could cause temporary device unavailability and disruption of its intended operation.

According to Hitachi Energy, RTU500 series CMU firmware versions 11.x and prior are affected. All affected versions are End-of-Life.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Upgrade the RTU500 series CMU firmware to a supported version (12.7.8, 13.9.1 or later) as recommended in the Hitachi Energy advisory, and apply the general mitigation factors described in the advisory.

Plugin Details

Severity: Medium

ID: 506487

File Name: tenable_ot_abb_CVE-2026-8067.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 10/27/2026

Updated: 10/27/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.68

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/o:hitachienergy:rtu500_firmware

Required KB Items: Tenable.ot/ABB

Exploit Ease: No known exploits are available

Patch Publication Date: 9/29/2026

Vulnerability Publication Date: 9/29/2026

Reference Information

CVE: CVE-2026-8067

CWE: 862

ICSA: 26-279-06

Detections

Analytics