CVE-2026-2459

highpriority · track · 32EPSS 0.004 · 30 %ileDEEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.37% (30th) EPSS
CVSS 8.1 · high
Is it mine?
6 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · cert_bund · cisa_csaf_ot

EPSS · scored 2026-10-22

A vulnerability exists in REB500 for an authenticated user with Installer role to access and alter the contents of directories that the role is not authorized to do so.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedRelion REB500cisa_csaf_ot

    Hitachi Energy recommends that users update to version 8.3.3.1.

  • MitigationRelion REB500cisa_csaf_ot

    For CVE-2026-2459, as a mitigation strategy, users may also disable the Installer role and enable it only during the firmware update process.

02

cvss

Technical severity, 0–10. One row per scoring source.

8.1
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.5–8.1

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 5.2
v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Nsecondary · CISA US
v4.07.4highCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.07.4highCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · cybersecurity@hitachienergy.com
v4.04.5mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-267USCWE-267US
05

affected products (6)

Products and version ranges known to be affected.

06

advisories (2)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-0511Hitachi Energy Relion REB500: Mehrere Schwachstellen ermöglichen PrivilegieneskalationDeutsch2026-02-24csaf · cert_bundDE

    Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Hitachi Energy Relion REB500 ausnutzen, um seine Privilegien zu erhöhen.

  • ICSA-26-062-02Hitachi Energy Relion REB500 Product2026-02-24icsa · cisa_csaf_otUS

    Hitachi Energy is aware of vulnerabilities that affect the Relion REB500 product versions listed in this document. Authenticated users with certain roles can exploit the vulnerabilities to access and modify the directory contents they are not authorized to do so. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation.

07

also known as (3)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcert_bundcisa_csaf_otnvdNVDCVE.orgMITRE
published 2026-02-24modified 2026-06-17
09

references (3)

External citations — patches, advisories, analysis.

scry

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