# CVE-2026-9854: Hitachi Energy SYS600 privilege escalation in RBAC mechanism

Source: https://junglewise.ai/threats/cve-2026-9854-hitachi-energy-sys600-privilege-escalation-in-rbac-mechanism  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-03. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-9854 · Severity: high · CVSS 7.8 · Published 2026-09-03

SYS600 is a control system platform used in industrial and energy infrastructure. Users with access to engineering tools can escalate their privileges to administrator level, gaining complete control over the underlying Windows host and potentially disrupting critical operations or accessing sensitive system data.

Technologies: [Hitachi Energy SYS600](https://junglewise.ai/threats/technologies/sys600), [Hitachienergy Microscada X Sys600](https://junglewise.ai/threats/technologies/microscada-x-sys600). Vendors: [Hitachi Energy](https://junglewise.ai/threats/vendors/hitachi-energy), [Hitachienergy](https://junglewise.ai/threats/vendors/hitachienergy).

## Quick answers

**Is CVE-2026-9854 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9854 being exploited in the wild.

**How severe is CVE-2026-9854?** High severity, with a CVSS score of 7.8, published 3 September 2026.

**Which products and versions are affected?** Hitachi Energy SYS600.

**Is there a fix for CVE-2026-9854?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9854 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-9854?** Check whether you run Hitachi Energy SYS600 or Hitachienergy Microscada X Sys600. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is a privilege escalation flaw in the role-based access control (RBAC) mechanism of SYS600. Users with legitimate access to engineering tools can bypass RBAC restrictions and escalate to administrator privileges on the Windows host. The attack is local in nature and requires the attacker to already have user access to the system. Successful exploitation grants full administrative control, allowing an insider or authenticated attacker to compromise system integrity, availability, and confidentiality. Patch availability and mitigation details should be verified from the vendor's official security advisory.

## Affected products

- Hitachi Energy SYS600

## Timeline

- 2026-09-03: disclosed

## References

- [https://publisher.hitachienergy.com/preview?DocumentID=8DBD000249&LanguageCode=en&DocumentPartId=&Action=Launch](https://publisher.hitachienergy.com/preview?DocumentID=8DBD000249&LanguageCode=en&DocumentPartId=&Action=Launch)

## Related threats

- [Hitachi Energy SYS600 unauthorized access to application objects](https://junglewise.ai/threats/cve-2026-9853-hitachi-energy-sys600-unauthorized-access-to-application-objects)
- [Hitachi Energy SYS600 CSV injection in logs](https://junglewise.ai/threats/cve-2026-9852-hitachi-energy-sys600-csv-injection-in-logs)