Vulnerability in Hitachi Energy Microscada Sys600

CVE-2026-9854

A vulnerability exists in SYS600 RBAC mechanism where users having access to the engineering tools could elevate their privileges to administrator level on the underlying Windows host, granting themselves full control over the host machine.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (3.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.3% 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-2026-9854: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-9854?
CVE-2026-9854 is a high-severity vulnerability in Hitachi Energy Microscada Sys600, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 7.8/10. Published 2026-09-03.
How severe is CVE-2026-9854?
High severity. CVSS v3 base score is 7.8 out of 10.