CVE-2026-2459Network attack vector

Installer-role directory access and modification

Published Feb 24, 2026 · Updated Feb 24, 2026

Authorization bypass in Hitachi Energy REB500 8.0.0.0 through 8.3.3.0 allows remote authenticated users to read and write restricted directories. The vendor states that Installer-role authorization permits access outside authorized directories but does not disclose the responsible interface, function, or permission check. Exploitation requires a network-reachable device and credentials assigned the Installer role; confirmed impact is limited to unauthorized file access and alteration.

CVSS severity7.4
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Hitachi Energy REB500 8.0.0.0 through 8.3.3.0 allows remote authenticated users to read and write restricted directories. The vendor states that Installer-role authorization permits access outside authorized directories but does not disclose the responsible interface, function, or permission check. Exploitation requires a network-reachable device and credentials assigned the Installer role; confirmed impact is limited to unauthorized file access and alteration.

The record

CVE
CVE-2026-2459
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
Hitachi Energy
Product
Relion REB500
Classifications
CWE-267, T1565.001, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.0.0.0 <=8.3.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Hitachi Energy · Relion REB500version=8.0.0.0 <=8.3.3.0

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
7.4Hitachi EnergyCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-267Privilege Defined With Unsafe Actions
T1565.001Stored Data Manipulation
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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