CVE-2026-9853: A vulnerability exists in SYS600 which allows any user authenticated to the operating system of the server hos

Routine

HIGH 7.8UPGRADE

CVE-2026-9853 is a high-severity flaw (CVSS 7.8) affecting microscada x sys600. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-303
Published	2026-09-03
Last modified	2026-09-09

Publisher (CNA): Hitachi Energy · Vendor: hitachienergy

Last updated 2026-09-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-03 13:06 UTCPublished CVE record published
2026-09-09 19:36 UTCUpdated Record last modified

hitachienergy microscada x sys600 UPGRADE

Affected: >= 10.0 and <= 10.8

Fixed in: newer than 10.8

Safe to downgrade to: a release before 10.0

1. Check installed version

apt-cache policy microscada-x-sys600 || rpm -q microscada-x-sys600 || microscada-x-sys600 --version

2. UPGRADE to newer than 10.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade microscada-x-sys600

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade microscada-x-sys600

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 10.0 (Debian / Ubuntu)

apt-cache madison microscada-x-sys600 sudo apt install microscada-x-sys600=<VERSION_BEFORE_10.0> sudo apt-mark hold microscada-x-sys600

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list microscada-x-sys600 sudo dnf downgrade microscada-x-sys600-<VERSION_BEFORE_10.0> sudo dnf versionlock add microscada-x-sys600

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

CISA Alerts and Advisories: Hitachi Energy MicroSCADA X SYS600 Product 2026-10-20

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-9853?

microscada x sys600: upgrade to newer than 10.8. Exact commands for each OS are on this page.

Is CVE-2026-9853 being exploited?

CVE-2026-9853 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-9853 affect?

CVE-2026-9853 affects microscada x sys600. Severity is high (CVSS 7.8). 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 SYS

How urgent is CVE-2026-9853?

Priority 28/100. High severity

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References

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