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.

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.003 (25.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-2459: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

References

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.