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CVE-2026-2459

Quick assessment

Affected
Hitachi Energy Relion REB500
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hitachi Energy Relion REB500是日本日立制作所（Hitachi）公司的一个分布式母线保护系统。 Hitachi Energy Relion REB500存在安全漏洞，该漏洞源于具有Installer角色的已验证用户可访问和修改其未授权目录的内容，可能导致访问控制不当。

AI Predicted 6.5 Difficulty: Easy EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1078.003 · Local Accounts
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I. Basic Information for CVE-2026-2459

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权定义了不安全动作
Source: CVE Program / CVE List V5
Vulnerability Title
Hitachi Energy Relion REB500 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hitachi Energy Relion REB500是日本日立制作所（Hitachi）公司的一个分布式母线保护系统。 Hitachi Energy Relion REB500存在安全漏洞，该漏洞源于具有Installer角色的已验证用户可访问和修改其未授权目录的内容，可能导致访问控制不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Hitachi Energy Relion REB500 8.0.0.0 ~ 8.3.3.0 -

II. Public POCs for CVE-2026-2459

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III. Intelligence Information for CVE-2026-2459

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Same Patch Batch · Hitachi Energy · 2026-02-24 · 4 CVEs total

CVE-2026-1773 Hitachi Energy RTU500 安全漏洞
CVE-2026-1772 Hitachi Energy RTU500 安全漏洞
CVE-2026-2460 Hitachi Energy Relion REB500 安全漏洞

IV. Related Vulnerabilities

Same product: Relion REB500
Same vendor: Hitachi Energy
Same weakness: CWE-267

V. Comments for CVE-2026-2459

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