CISA Publishes Hitachi Energy TRO600 and CoreTec Fixes
Tech GuruQuick Answer
CISA ICSA-26-302-02 and -03 cover four Hitachi Energy TRO600 and CoreTec vulnerabilities. Inventory exact models and releases, apply Hitachi's branch-specific updates or migration, isolate control networks, validate operational behavior with asset owners, and retain firmware and change evidence.
Confirm Scope And Apply The Supported Remediation
What to do now: Inventory TRO600, CoreTec4 and CoreTec5 assets, exact releases, network and local access, authenticated roles, energy-sector dependencies, owners, backups, and approved maintenance windows. Match each asset to the product and version table for its CVE; do not apply TRO600 targets to CoreTec or infer exposure from sector and severity alone. Update TRO600 to 9.2.2.1 or 9.1.2.0 as applicable, update CoreTec5 to 5.0.0, and plan the supported CoreTec4-to-CoreTec5 5.0.0 upgrade while maintaining CISA's network-isolation practices. Confirm firmware and configuration, test communications and control functions, verify restricted access and recovery, review relevant events where exposure existed, and retain vendor packages and change evidence.
Last verified: 2026-10-30 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | Hitachi Energy TRO600 series and CoreTec4/CoreTec5 energy-sector products |
|---|---|
| Advisory | ICSA-26-302-02 / ICSA-26-302-03 |
| CVEs | CVE-2026-106087, CVE-2026-10756, CVE-2026-13162, CVE-2026-43284 |
| Authoritative release date | 2026-10-29 12:00:00 UTC |
| Authority revision date | 2026-10-29 12:00:00 UTC |
| Affected versions | TRO600 9.2.1.6 and earlier or 9.1.1.0 and earlier as specified, plus CoreTec4 and CoreTec5 3.4.0 and earlier for the issue-specific vulnerabilities. |
| Fixed version | TRO600 9.2.2.1 or 9.1.2.0 as applicable, and CoreTec5 5.0.0; CoreTec4 customers are directed to upgrade to CoreTec5 5.0.0 |
| CVSS base score | 7.5 / 8.8 (CVSS v3.1) |
| CVSS severity | High |
| Exploitation status | CISA's SSVC records state exploitation was not known; neither republication states malicious exploitation.; no exploitation claim is inferred. |
What Changed
CISA republished Hitachi Energy advisories covering TRO600 localhost-service and arbitrary-file-read paths and CoreTec command injection and local privilege escalation.
What To Validate Now
- Inventory. Inventory TRO600, CoreTec4 and CoreTec5 assets, exact releases, network and local access, authenticated roles, energy-sector dependencies, owners, backups, and approved maintenance windows.
- Establish applicability. Match each asset to the product and version table for its CVE; do not apply TRO600 targets to CoreTec or infer exposure from sector and severity alone.
- Remediate. Update TRO600 to 9.2.2.1 or 9.1.2.0 as applicable, update CoreTec5 to 5.0.0, and plan the supported CoreTec4-to-CoreTec5 5.0.0 upgrade while maintaining CISA's network-isolation practices.
- Validate. Confirm firmware and configuration, test communications and control functions, verify restricted access and recovery, review relevant events where exposure existed, and retain vendor packages and change evidence.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
These are operational-technology systems. Perform impact and safety analysis, coordinate with the accountable process owner, preserve rollback, and do not apply an image intended for another product line.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
