What is CVE-2026-2459?

CVE-2026-2459 is a high-severity vulnerability in Hitachi Energy Relion Reb500, classified under Privilege Defined With Unsafe Actions. CVSS score: 8.1/10. Published 2026-02-24.

How severe is CVE-2026-2459?

High severity. CVSS v3 base score is 8.1 out of 10.

Privilege escalation in Hitachi Energy Relion Reb500

CVE-2026-2459

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.

EPSS: 0.003 (24.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Hitachi Energy Relion Reb500 — versions 8.0.0.0
Hitachienergy Reb500
Hitachienergy Reb500_firmware

Weakness classification (CWE)

CWE-267 — Privilege Defined With Unsafe Actions

References

cybersecurity@hitachienergy.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-2459?: CVE-2026-2459 is a high-severity vulnerability in Hitachi Energy Relion Reb500, classified under Privilege Defined With Unsafe Actions. CVSS score: 8.1/10. Published 2026-02-24.
How severe is CVE-2026-2459?: High severity. CVSS v3 base score is 8.1 out of 10.