# CVE-2026-9853: Missing authorization in MicroSCADA SYS600

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

- **Severity:** High 8.5 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Sep 2026
- **Updated:** 3 Sep 2026
- **Also known as:** GHSA-9hq3-8gr4-57hv

## 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 (Incorrect Implementation of Authentication Algorithm)

## Which versions are affected by CVE-2026-9853?

It affects 1 product.


Products: 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.

## Is CVE-2026-9853 being exploited?

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

## Other vulnerabilities in Hitachi Energy MicroSCADA SYS600

- [CVE-2026-9854](https://insights.sbomify.com/CVE-2026-9854/): Privilege escalation in MicroSCADA SYS600 (high 8.5)
- [CVE-2025-39204](https://insights.sbomify.com/CVE-2025-39204/): Information disclosure in MicroSCADA X SYS600 (high 8.5)
- [CVE-2022-29490](https://insights.sbomify.com/CVE-2022-29490/): Missing authorization in MicroSCADA X SYS600 (high 8.5)
- [CVE-2025-39202](https://insights.sbomify.com/CVE-2025-39202/): Missing authorization in MicroSCADA X SYS600 (high 8.3)
- [CVE-2024-7940](https://insights.sbomify.com/CVE-2024-7940/): Missing authorization in MicroSCADA SYS600 (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9853 and fix it if it is affected.

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

Affected product: Hitachi Energy MicroSCADA SYS600. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-9853/ (Markdown: https://insights.sbomify.com/CVE-2026-9853/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9853
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9853
- OSV: https://osv.dev/vulnerability/CVE-2026-9853

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9853/
Summaries are generated and may contain mistakes; the official description above is the record.