CVE-2026-9853 Missing authorization in MicroSCADA SYS600

High 8.5 Published 3 Sep 2026 Updated 3 Sep 2026

Authenticated OS users can read and modify application objects without proper SYS600 authentication, compromising SCADA system integrity.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-9853?

CVE-2026-9853 is a high-severity missing authorization vulnerability in Hitachi Energy MicroSCADA SYS600, published on 3 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability exists in SYS600 which allows any user authenticated to the operating system of the server hosting the application to read and modify application objects without being authenticated to the SYS600 system itself.

Only the SYS600 system users should be permitted to view and modify application objects.

Weakness: CWE-303

Which versions are affected by CVE-2026-9853?

It affects 1 product.

Products include Hitachienergy Microscada X Sys600.

How do I fix CVE-2026-9853?

No fix has been published for CVE-2026-9853 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-9853 being exploited?

There is no known exploitation of CVE-2026-9853 in the wild and no public exploit code.

Sources

Also known as GHSA-9hq3-8gr4-57hv.